Cruisers Forum
 


Join CruisersForum Today

Reply
 
Thread Tools Rate Thread Display Modes
Old 08-09-2012, 04:40   #1
Registered User

Join Date: Jan 2012
Location: Phuket, Thailand
Boat: Ted Brewer, One off, 36' sloop
Posts: 59
New Aluminium Owner with Questions

I own a Kanter sailboat. It is a one off Ted Brewer 36 foot cruising boat built in 1982. I wanted to know what you are using for bottom paint. I am located now in Phuket, Thailand and I need to put antifouling. Since I have now run out of TBT bottom paint, I now have to switch another paint without copper. Unfortunately all the aluminum hull antifouling paints available have a poor reputation for a boat that spend a lot of time on her mooring in our shallow water anchorage. If you have heard of any new ideas on how to avoid using copper based antifouling with a thick barrier coat to protect the hull, please let me know. Also, I need to replace my anodes that I suspect are made of zinc that were fitted by the former owner. They have been on the hull for the 8 years that I have owned her and only about 10% of the anode has wasted. I have been advised to change to Maganese but cannot find the right shape anode to fit my four anode attaching places on the hull. Do you know of any other forums for aluminum boat owners where I can find more information?
__________________

__________________
thaisail is offline   Reply With Quote
Old 08-09-2012, 05:13   #2
Moderator
 
noelex 77's Avatar

Cruisers Forum Supporter

Join Date: Jul 2007
Location: Living on dirt waiting for our new yacht to be built.
Boat: Half built Bestevaer.
Posts: 10,618
Re: Aluminium Boat Pro and Con opinions?

Welcome to forum thaisail.
Zinc is the correct anode material if the boat is kept in salt water. If the anodes are only worn by 10% they don't need changing.
We use Trilux 33 antifouling. You need a good expoxy barrier coat on the aluminium first if you have a look at international paints we'd site they have all the details.
There are some new non metallic antifoulings that look promising, but I have not used them.
__________________

__________________
noelex 77 is offline   Reply With Quote
Old 08-09-2012, 05:42   #3
Moderator Emeritus
 
GordMay's Avatar

Join Date: Mar 2003
Location: Thunder Bay, Ontario - 48-29N x 89-20W
Boat: (Cruiser Living On Dirt)
Posts: 31,572
Images: 240
Re: New Aluminium Owner with questions

Greetings and welcome aboard the CF, thaisail.
__________________
Gord May
"If you didn't have the time or money to do it right in the first place, when will you get the time/$ to fix it?"



GordMay is online now   Reply With Quote
Old 08-09-2012, 07:43   #4
ice
Registered User

Join Date: Jan 2012
Posts: 105
Re: Aluminium Boat Pro and Con opinions?

Quote:
Originally Posted by noelex 77 View Post
Welcome to forum thaisail.
Zinc is the correct anode material if the boat is kept in salt water. If the anodes are only worn by 10% they don't need changing.
We use Trilux 33 antifouling. You need a good expoxy barrier coat on the aluminium first if you have a look at international paints we'd site they have all the details.
There are some new non metallic antifoulings that look promising, but I have not used them.
absolutely correct on all points:

Zinc
Trilux 33
good epoxy barrier coat
__________________
ice is offline   Reply With Quote
Old 10-09-2012, 22:12   #5
Registered User

Join Date: Jan 2012
Location: Phuket, Thailand
Boat: Ted Brewer, One off, 36' sloop
Posts: 59
Quote:
Originally Posted by ice

absolutely correct on all points:

Zinc
Trilux 33
good epoxy barrier coat
The results that I hear from the boats that used Trilux 33 here in Phuket are very poor. Most report that the paint will only work for 6 months. After that barnacles will begin to attach. The cost of Trilux 33 is 3 times greater than copper paint and only one third as effective. Our boat spends a lot of time on her shallow water mooring with only 1 foot of water below her keel at low tide.

Please can you tell me what kind of results you are getting with Trilux 33? I would like to use Trilux but I cannot afford to haul out every 6 months. The paint contractor wants to add 3% TBT and maybe this will help. We can still buy pure liquid TBT from a small shop in Penang, Malaysia.
__________________
thaisail is offline   Reply With Quote
Old 10-09-2012, 23:55   #6
Senior Cruiser
 
atoll's Avatar

Cruisers Forum Supporter

Join Date: Mar 2010
Location: gettin naughty on the beach in cornwall
Boat: 63 custom alloy sloop,macwester26,prout snowgoose 37 elite catamaran!
Posts: 9,310
Images: 75
Re: New Aluminium Owner with Questions

you want to do a bit more reasearch,tbt is the only paint to use on alloy,trilux is absolutly useless for tropical waters.

tbt is banned in europe and the us for small vessels but still available for bigger vessels,check the ship yards,what ever you do do not use a copper based anti fouing on alu.
__________________
my catamaran building project updates http://www.cruisersforum.com/forums/...36#post2502136
atoll is online now   Reply With Quote
Old 11-09-2012, 04:03   #7
Registered User
 
Celestialsailor's Avatar

Join Date: Nov 2006
Location: In Mexico, working on the boat
Boat: Hallberg Rassy 35. and 14ft.Whitehall pulling skiff.
Posts: 8,013
Images: 5
Re: New Aluminium Owner with Questions

Quote:
Originally Posted by atoll View Post
you want to do a bit more reasearch,tbt is the only paint to use on alloy,trilux is absolutly useless for tropical waters.

tbt is banned in europe and the us for small vessels but still available for bigger vessels,check the ship yards,what ever you do do not use a copper based anti fouing on alu.
I was questioning that myself. Regardless of the barrier coat I would think there would be electrolysis between the copper and aluminum. Back in the 80's, I purchased TBT from a couple of guys that bought bulk military surplus paints. It lasted 4 years.
__________________
"Life is not a journey to the grave with the intention of arriving safely in a pretty and well-preserved body, but rather to skid in broadside, thoroughly used up, totally worn out, and loudly proclaiming: Wow - what a ride!"

http://wwwjolielle.blogspot.com/
Celestialsailor is offline   Reply With Quote
Old 11-09-2012, 04:25   #8
Pusher of String
 
foolishsailor's Avatar

Cruisers Forum Supporter

Join Date: Feb 2007
Location: On the hard; Trinidad
Boat: Trisbal 42, Aluminum Cutter Rigged Sloop
Posts: 2,314
Images: 19
Sadly trilux 33 is the only viable solution.

As your boat is an older one, like mine, it is even more important to do the hull correctly. Older hulls have an infinite number of microabrasions and a highly microtextured surface. This can increase the effective surface area by as much as 20% and makes older aluminum hulls highly suseptable to issues with copper paints.

A properly prepared well bonded barriar coat with trilux 33 is the only real solution for long term viability.

Minaret should be along shortly to give some good advice
__________________
"So, rather than appear foolish afterward, I renounce seeming clever now."
William of Baskerville

"You will do foolish things, but do them with enthusiasm."
Sidonie Gabrielle Colette
foolishsailor is offline   Reply With Quote
Old 11-09-2012, 04:31   #9
Pusher of String
 
foolishsailor's Avatar

Cruisers Forum Supporter

Join Date: Feb 2007
Location: On the hard; Trinidad
Boat: Trisbal 42, Aluminum Cutter Rigged Sloop
Posts: 2,314
Images: 19
Re: New Aluminium Owner with Questions

I am getting ready for a full strip and repaint of my hull in a couple of months and here was some great advice I got from Minaret, who is a pro-builder on this forum.

You can see he recommends using Trinidad SR vs. Trilux 33 and I am seriously considering it...

Quote:
1. Sand blast with medium mesh silica sand. Blast bright to a profile of 3-4 mils. Alternatively, if you can't find a good blaster, chemical strip with aircraft stripper, wipe two rag technique with 202 twice, and grind 36 grit. If you have thin plate you might step the profile back to 60, though manufacterers specs state 36 profile.

2. Etch with Alumiprep 33 immediately. Clean after blasting only with carefully filtered high pressure air.

3. Passivate with hexavalent chromium conversion, use Alodine. Follow instructions carefully.

4. Apply a slightly thinned (10%) coat of Interlux 2000e. Use 2316N. Apply with a 1/4" candy striper on a 9" frame. Roll nice coats carefully.

5. Apply a coat of 2000 neat. Wait 24 hrs.

6. If any fairing is required apply Interfil 830 by chemical bond to the 2000. Board fair with 80 grit. Apply 2 coats of neat 2000 to any areas of fairing.

7. Apply a final coat of 2000. This is one more than the manufacterers requires, but provides a nice even finish and is generally required to catch the bonding window of the bottom paint.

8. I know you race, so if you are trying to achieve a race bottom let the 2000 cure for 48 hrs and then sand to 180 profile. If you are a total racing geek trying to develop true laminar flow board fair to 180 with a flexy board. If you are more sane than this, catch the chemical bond window by following the instructions carefully (thumbprint test). Apply the bottom paint of your choice, first making sure it is compatible with 2000 (most are). I prefer Trinidad SR.

9. If you have sanded the 2000 for a race bottom, you will either want to spray the bottom paint with an airless or roll 3 coats instead of two and then wet sand it. You can take that as far as you like, but unless you use a hard race paint I wouldn't go further than 400 wet, there's not much point.

I realize this advice involves mixing products from a number of manufacterers, which may complicate any warranty issues. But my experience has been that no manufacterer will do anything for you anyway, other than sending you some free product, which is of course no help at all. This recipe is what has worked for us, we have been using it for many years. If you do some serious research you will find we are not the only ones. It's a great combo for aluminum, especially below the waterline, as the barrier coat prevents any moisture from getting through and causing the alum to chalk up. It is the most long term solution I have found for aluminum. I have painted some very nice boats this way with no warranty issues.
__________________
"So, rather than appear foolish afterward, I renounce seeming clever now."
William of Baskerville

"You will do foolish things, but do them with enthusiasm."
Sidonie Gabrielle Colette
foolishsailor is offline   Reply With Quote
Old 11-09-2012, 04:57   #10
Senior Cruiser
 
atoll's Avatar

Cruisers Forum Supporter

Join Date: Mar 2010
Location: gettin naughty on the beach in cornwall
Boat: 63 custom alloy sloop,macwester26,prout snowgoose 37 elite catamaran!
Posts: 9,310
Images: 75
Re: New Aluminium Owner with Questions

http://www.epaint.net/NAVY.pdf

try to get hold of some e-paint!from the us navy

http://www.epaint.com/products/19
__________________
my catamaran building project updates http://www.cruisersforum.com/forums/...36#post2502136
atoll is online now   Reply With Quote
Old 11-09-2012, 05:19   #11
Senior Cruiser
 
atoll's Avatar

Cruisers Forum Supporter

Join Date: Mar 2010
Location: gettin naughty on the beach in cornwall
Boat: 63 custom alloy sloop,macwester26,prout snowgoose 37 elite catamaran!
Posts: 9,310
Images: 75
Re: New Aluminium Owner with Questions

Quote:
Originally Posted by foolishsailor View Post
I am getting ready for a full strip and repaint of my hull in a couple of months and here was some great advice I got from Minaret, who is a pro-builder on this forum.

You can see he recommends using Trinidad SR vs. Trilux 33 and I am seriously considering it...
after going to all that expense!

you might want to read this
Trinidad SR - Bottom Paint Problem
__________________
my catamaran building project updates http://www.cruisersforum.com/forums/...36#post2502136
atoll is online now   Reply With Quote
Old 11-09-2012, 05:30   #12
Senior Cruiser
 
atoll's Avatar

Cruisers Forum Supporter

Join Date: Mar 2010
Location: gettin naughty on the beach in cornwall
Boat: 63 custom alloy sloop,macwester26,prout snowgoose 37 elite catamaran!
Posts: 9,310
Images: 75
Re: New Aluminium Owner with Questions

another interesting link here
Copper Antifouling on a Painted Aluminum Hull?
__________________
my catamaran building project updates http://www.cruisersforum.com/forums/...36#post2502136
atoll is online now   Reply With Quote
Old 11-09-2012, 05:35   #13
Senior Cruiser
 
atoll's Avatar

Cruisers Forum Supporter

Join Date: Mar 2010
Location: gettin naughty on the beach in cornwall
Boat: 63 custom alloy sloop,macwester26,prout snowgoose 37 elite catamaran!
Posts: 9,310
Images: 75
Re: New Aluminium Owner with Questions

Quote:
Originally Posted by foolishsailor View Post
Sadly trilux 33 is the only viable solution.

As your boat is an older one, like mine, it is even more important to do the hull correctly. Older hulls have an infinite number of microabrasions and a highly microtextured surface. This can increase the effective surface area by as much as 20% and makes older aluminum hulls highly suseptable to issues with copper paints.

A properly prepared well bonded barriar coat with trilux 33 is the only real solution for long term viability.

Minaret should be along shortly to give some good advice
another option might be using this proven paint system if you are going to sand blast etc

Sigma Coatings - Marine, SIGMAGLIDE, ultimate fouling system
__________________
my catamaran building project updates http://www.cruisersforum.com/forums/...36#post2502136
atoll is online now   Reply With Quote
Old 11-09-2012, 13:29   #14
Pusher of String
 
foolishsailor's Avatar

Cruisers Forum Supporter

Join Date: Feb 2007
Location: On the hard; Trinidad
Boat: Trisbal 42, Aluminum Cutter Rigged Sloop
Posts: 2,314
Images: 19
Thanks for the links, will look into them...
__________________
"So, rather than appear foolish afterward, I renounce seeming clever now."
William of Baskerville

"You will do foolish things, but do them with enthusiasm."
Sidonie Gabrielle Colette
foolishsailor is offline   Reply With Quote
Old 11-09-2012, 15:23   #15
Registered User

Join Date: Jan 2012
Location: Phuket, Thailand
Boat: Ted Brewer, One off, 36' sloop
Posts: 59
Quote:
Originally Posted by atoll
http://www.epaint.net/NAVY.pdf

try to get hold of some e-paint!from the us navy

http://www.epaint.com/products/19
The last time I checked, epaint was only available in the US. I am in Thailand. Also I a not sure how effective this paint would be in shallow tropical waters.
__________________

__________________
thaisail is offline   Reply With Quote
Reply

Thread Tools
Display Modes Rate This Thread
Rate This Thread:

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off




Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -7. The time now is 04:58.


Google+
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2017, vBulletin Solutions, Inc.
Social Knowledge Networks
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2017, vBulletin Solutions, Inc.

ShowCase vBulletin Plugins by Drive Thru Online, Inc.