Cruisers Forum
 


Join CruisersForum Today

Reply
 
Thread Tools Rate Thread Display Modes
Old 18-07-2012, 09:08   #1
One of Those
 
Canibul's Avatar

Cruisers Forum Supporter

Join Date: Sep 2006
Location: Turks and Caicos Islands
Boat: Catalac 12M
Posts: 3,209
Poly resin over 5200?

I just used 5200 to seal up a crack in a non-critical plywood bulkhead. I'm letting it set up for a few more days before my plan to rough it up and glass over it with cloth and resin. I went to the only local marine supply shop on the island yesterday looking for a small fiberglass kit. They had one in stock, a pint of resin, tube of hardener, square yard of cloth, etc. I bought it. Everclear, or Evercoat, something like that.

When I got home I noticed it's polyester resin. All my old surfboard building days and afterwards I always used epoxy resin, so have zilch experience with this stuff.

The smallest amount of epoxy resin I saw at the store was a gallon of West Marine stuff, but I am not really interested in buying that much. Its all expensive here. The kit was almost forty bucks. A half pint should do me for the first coat, with enough left over to add another layer if I feel like it needs it.

Do you guys know of any issues putting polyester resin over 5200?
__________________

__________________
Expat life in the Devil's Triangle:
http://2gringos.blogspot.com/
Canibul is offline   Reply With Quote
Old 18-07-2012, 10:55   #2
Registered User
 
neilpride's Avatar

Join Date: Jul 2009
Location: in the world
Boat: csy 44 tall rig.
Posts: 3,099
Re: Poly resin over 5200?

I dont get it, why you use 5200 to seal a crack ? better to use epoxy mixed with silica or microballons , Polyester over 5200 is new for me, never try it, but for sure Polyester is not a good adesive over 5200, anyway if the crack is just a scracht in a hiden place and is not structural go ahead,,, but in your shoes i remove the 5200 and do it again properly with epoxy for a last forever repair...
Good luck!
__________________

__________________
neilpride is offline   Reply With Quote
Old 18-07-2012, 11:00   #3
Registered User

Join Date: Oct 2008
Location: St-Lazare, Qc. Canada
Boat: Whitby 42 - Esmeralda II
Posts: 160
Re: Poly resin over 5200?

Polyester does not adhere to epoxy, and I would use epoxy with microcells as a putty rather than 3M 5200, you are trying to mix various incompatible chemicals, it will probably not stick very long.
__________________
Roland on Esmeralda II - Whitby 42
rolandgilbert99 is offline   Reply With Quote
Old 18-07-2012, 11:24   #4
Registered User
 
xymotic's Avatar

Join Date: Dec 2007
Posts: 1,076
Re: Poly resin over 5200?

West System is not 'West Marine' stuff, though they do sell it.

West marine AND West System do make an epoxy pack that does what you want:
WEST SYSTEM Fiberglass Repair Kit, 105-K Repair Kit at West Marine
__________________
xymotic is offline   Reply With Quote
Old 18-07-2012, 11:32   #5
Senior Cruiser
 
Cheechako's Avatar

Cruisers Forum Supporter

Join Date: Aug 2006
Location: Skagit City, WA
Posts: 19,359
Re: Poly resin over 5200?

The 5200 is done, leave it. Most Polyurethane sealants like 5200 are stated as being sandable and paintable. Do a small test area first if you are worried. the resin should cure quickly anyway.
__________________
"I spent most of my money on Booze, Broads and Boats. The rest I wasted" - Elmore Leonard











Cheechako is offline   Reply With Quote
Old 18-07-2012, 11:38   #6
Senior Cruiser
 
SkiprJohn's Avatar

Cruisers Forum Supporter

Join Date: May 2006
Location: Kea'au, Big Island, Hawaii
Boat: Cascade, Sloop, 42 - "Casual"
Posts: 14,192
Re: Poly resin over 5200?

Aloha Canibul,
You mentioned that it is a non-critical bulkhead. Is it something that you see all the time or is it hidden?
Usually 5200 is used as an adhesive bedding compound and not as a gap filler so that's probably why you got a couple of critical posts. I consider 5200 too expensive to use to fill gaps. That doesn't mean you can't do it. If the crack is filled and doesn't need any more reinforcement why not just paint it? If it does need more strength then you'll need to do something different. Once you've got 5200 on something it might be really tough to remove so you might have to bite the bullet and get an epoxy repair kit.
kind regards,
__________________
John
SkiprJohn is offline   Reply With Quote
Old 18-07-2012, 12:12   #7
One of Those
 
Canibul's Avatar

Cruisers Forum Supporter

Join Date: Sep 2006
Location: Turks and Caicos Islands
Boat: Catalac 12M
Posts: 3,209
Re: Poly resin over 5200?

Thanks for the useful input. So epoxy WILL stick to 5200?

I might have to paint it in the short term, if the poly resin won't work.

I'm limited to what I can buy here. What West Marine stocks in the US might as well be on Mars for all the good it does me here.
__________________
Expat life in the Devil's Triangle:
http://2gringos.blogspot.com/
Canibul is offline   Reply With Quote
Old 23-07-2012, 16:49   #8
Registered User

Join Date: May 2012
Location: FL
Posts: 28
Images: 1
Re: Poly resin over 5200?

35 years ago I watched a toothless, tobacco chewin' crew from the Louisiana bayou spread drums of 5200 onto a wooden 72 foot shrimper. The wood didn't look great and the seams had opened a little, but she had gotten to the yard on her own bottom and had been in the shrimpin' service for decades. When they were done troweling on the 5200 they let it cure it couple days and started glassing over it with mat and polyester resin. Seeing as how i was almost 30 years old and knew everything there was to know about the fiberglass business, I quietly laughed and walked away. Few days later, i was talking to one of the crew and politely asked how many of these they had done and if they were sure it worked, how long had these repaired boats been in service, etc. He replied, after a large spit of chaw, "bout a hunnert" and the oldest was about ten years. I have since seen a couple of these damn things, after 35 years, still in service!!!! So yeah, I guess you can put poly over 5200. And, turns out, after almost 50 years in the business, what I've learned is that I'm still learning!!!!
__________________
Fiberglass1Inc is offline   Reply With Quote
Old 23-07-2012, 17:09   #9
Registered User
 
brankin's Avatar

Join Date: Jul 2010
Location: Florida
Boat: Endeavour 43
Posts: 232
Re: Poly resin over 5200?

If you need to buy epoxy in smaller quantities, here is a good supplier
http://www.fiberglasssupplydepot.com

As with all small shipments, the shipping gets to be a large percentage of the total price...but I guess it beat the gas bill to drive across town.
__________________

__________________
brankin 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 20:27.


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.