Cruisers Forum
 


Join CruisersForum Today

Reply
 
Thread Tools Rate Thread Display Modes
Old 29-08-2012, 12:47   #1
Registered User

Join Date: Mar 2007
Boat: Privilege 482
Posts: 363
Blisters!! Peeling or Sandblasting??

We just had a prospective 45' catamaran surveyed and the 20 year old hulls have significant blistering everywhere. The blisters are primarily small (about 1/2 inch), but in some areas are densely packed together, so close to 50% of the surface area is blisters.

The surveyor is recommending a peel job. The broker thinks a sandblasting is sufficient as the blisters are small. I'm assuming that the sandblasting would still leave most of the gel coat on, but am not certain?

When is one technique better than the other? What are the ball park respective costs? Boat is in New England.

Thanks- Matt
__________________

__________________
teneicm is offline   Reply With Quote
Old 29-08-2012, 12:50   #2
Registered User

Join Date: Mar 2012
Location: North Carolina
Boat: Seaward 22
Posts: 691
Re: Blisters!! Peeling or sandblasting??

Have no idea on the cost of your cat, but my little 22 was covered in little blisters. I had the bottom peeled and dried out. Amazing how much water weight i was carrying around. My dry boat is much more lively.
__________________

__________________
ohdrinkboy is offline   Reply With Quote
Old 29-08-2012, 15:00   #3
Registered User

Join Date: Jul 2009
Boat: Nassau 42 SV Ceol Mor
Posts: 789
Re: Blisters!! Peeling or Sandblasting??

The surveyor derives no financial benefit from offering his honesy opinion on how to best correct the issue. The broker(if its the sellers broker)however, DOES benefit if he can convince you that the cheaper repair method will be just fine.

Which opinion do you think is more trustworthy?
__________________
S/V Ceol Mor
42 Nassau Undergoing refit in Kemah, Tx
Our little blog has moved: www.theceolmors.blogspot.com
Mimsy is offline   Reply With Quote
Old 29-08-2012, 15:48   #4
Resin Head
 
minaret's Avatar

Cruisers Forum Supporter

Join Date: Aug 2007
Location: Seattle WA
Boat: Nauticat
Posts: 7,201
Images: 52
Re: Blisters!! Peeling or Sandblasting??

Peeling is definitely the superior method because it will allow the necessary amount of material to be removed while keeping the surface fair. The broker has no idea what he's talking about. Are the blisters restricted to below the waterline or are they above as well?
__________________
minaret is offline   Reply With Quote
Old 29-08-2012, 16:00   #5
Senior Cruiser
 
Cheechako's Avatar

Cruisers Forum Supporter

Join Date: Aug 2006
Location: Skagit City, WA
Posts: 19,365
Re: Blisters!! Peeling or Sandblasting??

Peel, the un blistered gel coat will be soon! Hope there's enough glass on a cat for a peel!
__________________
"I spent most of my money on Booze, Broads and Boats. The rest I wasted" - Elmore Leonard











Cheechako is offline   Reply With Quote
Old 29-08-2012, 16:37   #6
Senior Cruiser
 
skipmac's Avatar

Cruisers Forum Supporter

Join Date: Oct 2007
Location: 29 49.16 N 82 25.82 W
Boat: Pearson 422
Posts: 12,383
Re: Blisters!! Peeling or Sandblasting??

Another vote to peel. I just did my boat and researched and read everything I could on the subject before deciding. For multiple reasons I think peeling is the better option.
__________________
The water is always bluer on the other side of the ocean.
skipmac is offline   Reply With Quote
Old 29-08-2012, 18:15   #7
Registered User

Join Date: Mar 2007
Boat: Privilege 482
Posts: 363
Re: Blisters!! Peeling or Sandblasting??

Thanks guys. The more I read the more I agree with the peel. Someone offline also mentioned that sandblasting really roughens up the underlying fiberglass surface and makes it much more conducive to further water penetration due to the increased surface area. About the only benefit of sanblasting seems to be it's about 1/2 the cost.
__________________
teneicm is offline   Reply With Quote
Old 29-08-2012, 19:17   #8
Moderator Emeritus
 
Ex-Calif's Avatar

Cruisers Forum Supporter

Join Date: May 2007
Location: Singapore
Boat: Maxi 77 - Relax Lah!
Posts: 11,514
Images: 4
Re: Blisters!! Peeling or Sandblasting??

I vote run away...

Unless the repair is completely and suitable factored into the price and you get it done professionally.

Dry out time can be significant and in that time you are not enjoying your new boat.

2 cents worth.
__________________
Relax Lah! is For Sale <--- Click
Click--> Custom CF Google Search or CF Rules
You're gonna need a bigger boat... - Martin Brody
Ex-Calif is offline   Reply With Quote
Old 29-08-2012, 20:35   #9
Senior Cruiser
 
bstreep's Avatar

Cruisers Forum Supporter

Join Date: Oct 2007
Location: San Antonio, TX/Port Aransas, TX
Boat: 1990 Macintosh 47, "Merlin"
Posts: 2,274
Re: Blisters!! Peeling or Sandblasting??

Normally, I'm a "grind, fill, paint, forget" until the next bottom job kind of guy. But 50% coverage is a big deal. If you get a good deal, I'd certainly consider doing this, rather than running.
__________________
Bill Streep
San Antonio/Port Aransas, TX
bstreep is offline   Reply With Quote
Old 29-08-2012, 21:10   #10
Senior Cruiser
 
skipmac's Avatar

Cruisers Forum Supporter

Join Date: Oct 2007
Location: 29 49.16 N 82 25.82 W
Boat: Pearson 422
Posts: 12,383
Re: Blisters!! Peeling or Sandblasting??

Another comment. You mention the blisters are small but more important than diameter is depth and how far they spread under the gel coat.

Have you popped any? How deep does it go? Just under the gel coat or into the glass? Are they filled with brown, smelly liquid or clear slightly sweetish liquid?

Agree completely that the boat would have to be a really good deal. Get at least 2-3 estimates on the total cost of the repair, including hauling and storage while it is sitting for several months to dry, add 50-100% to that estimate and subtract that what a similar boat would sell for with a good bottom.

I just did a 42' monohull and just the peel and seal was $6000 and I think I got a very good deal. Figure double that for a cat plus a few boat bucks more for storage, etc and you could be looking at $20,000, in New England probably a lot more.

If you want to move the boat to N Florida I highly recommend the guy that did mine and would be a lot cheaper than New England.
__________________

__________________
The water is always bluer on the other side of the ocean.
skipmac is offline   Reply With Quote
Reply

Tags
blisters

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 01:13.


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.