Reply
 
Thread Tools Search this Thread Display Modes
 
Old 02-16-2018, 11:02 AM   #1
Guru
 
City: Port Townsend
Country: North America
Vessel Name: The Promise
Vessel Model: Roughwater 35
Join Date: Sep 2012
Posts: 1,563
Show us your blisters

These are on a boat next to mine in the yard.

Click image for larger version

Name:	IMG_0196.jpg
Views:	194
Size:	120.4 KB
ID:	73008
__________________
Advertisement

dhmeissner is offline   Reply With Quote
Old 02-16-2018, 03:40 PM   #2
GFC
Guru
 
GFC's Avatar
 
City: Tri Cities, WA
Country: USA
Vessel Name: Beachcomber
Vessel Model: Sea Ray 550 Sedan Bridge
Join Date: Nov 2012
Posts: 3,531
Dave, I'd move my boat just on the off chance that those ugly blisters are catching!
__________________

__________________
Mike and Tina
Beachcomber 1995 Sea Ray 550 Sedan Bridge
GFC is offline   Reply With Quote
Old 02-16-2018, 03:55 PM   #3
Guru
 
psneeld's Avatar
 
City: AICW
Country: USA
Vessel Name: Freedom
Vessel Model: Albin 40
Join Date: Oct 2011
Posts: 19,395
Based on the swiss cheese look of the gel coat...mine looked like that....

I would take off all the gel and matt underneath. Check for hydrolyzed laminates...then put on a new bottom.

Just filling those blister holes may do little or nothing for much more serious damage.
psneeld is online now   Reply With Quote
Old 02-16-2018, 05:32 PM   #4
Guru
 
City: Port Townsend
Country: North America
Vessel Name: The Promise
Vessel Model: Roughwater 35
Join Date: Sep 2012
Posts: 1,563
Quote:
Originally Posted by psneeld View Post
Based on the swiss cheese look of the gel coat...mine looked like that....

I would take off all the gel and matt underneath. Check for hydrolyzed laminates...then put on a new bottom.

Just filling those blister holes may do little or nothing for much more serious damage.


I’d think that’s a candidate for a “peel” some of those are a 1/4” deep.
dhmeissner is offline   Reply With Quote
Old 02-16-2018, 05:44 PM   #5
Guru
 
tiltrider1's Avatar
 
City: Seattle
Country: USA
Vessel Name: AZZURRA
Vessel Model: Ocean Alexander 54
Join Date: Aug 2017
Posts: 1,350
That looks worse than 1978 uniflite made out of fire resistant gelcoat.
tiltrider1 is offline   Reply With Quote
Old 02-16-2018, 06:22 PM   #6
Guru
 
Moonstruck's Avatar
 
City: Hailing Port: Charleston, SC
Country: USA
Vessel Name: Moonstruck
Vessel Model: Sabre 42 Hardtop Express
Join Date: Nov 2008
Posts: 8,220
Quote:
Originally Posted by dhmeissner View Post
These are on a boat next to mine in the yard.

Attachment 73008
That looks like the wall behind the St. Valentine Day massacre. The one in Chicago.
__________________
Don on Moonstruck
Sabre 42 Hardtop Express & Blackfin 25 CC
When cruising life is simpler, but on a grander scale (author unknown)
http://moonstruckblog.wordpress.com/
Moonstruck is offline   Reply With Quote
Old 02-16-2018, 07:50 PM   #7
Guru
 
City: Port Townsend
Country: North America
Vessel Name: The Promise
Vessel Model: Roughwater 35
Join Date: Sep 2012
Posts: 1,563
Quote:
Originally Posted by tiltrider1 View Post
That looks worse than 1978 uniflite made out of fire resistant gelcoat.
That’s what our shipwright said.
dhmeissner is offline   Reply With Quote
Old 02-16-2018, 08:04 PM   #8
Guru
 
Comodave's Avatar
 
City: Au Gres, MI
Country: US
Vessel Name: Never Say Never
Vessel Model: President 41 DC
Join Date: Jul 2015
Posts: 4,552
I looked at a 42’ Uniflite that was worse than that. The broker said it had a minor blister problem...
Comodave is online now   Reply With Quote
Old 02-16-2018, 08:46 PM   #9
Guru
 
jimisbell's Avatar
 
City: Ingleside-On-The-Bay, Texas
Country: USA
Vessel Name: Papillon
Vessel Model: 1978 Mainship 34 Trawler #95
Join Date: Jan 2018
Posts: 549
It looks like it is infectious.
jimisbell is offline   Reply With Quote
Old 02-16-2018, 08:48 PM   #10
Guru
 
Lou_tribal's Avatar
 
City: Quebec
Country: Canada
Vessel Name: Bleuvet
Vessel Model: Custom Built
Join Date: Jan 2016
Posts: 3,410
How old is your boat? Looks like a teenager lol

L
Lou_tribal is online now   Reply With Quote
Old 02-16-2018, 09:21 PM   #11
Senior Member
 
jimL's Avatar
 
City: Port Niantic, CT
Country: USA
Vessel Name: General's Quarters
Vessel Model: 2005 Mainship 430 Aft Cabin Trawler
Join Date: Mar 2015
Posts: 191
Yikes! What else can I say?
Jim
jimL is offline   Reply With Quote
Old 02-16-2018, 09:33 PM   #12
Guru
 
Nomad Willy's Avatar
 
City: Concrete Washington State
Country: USA
Vessel Name: Willy
Vessel Model: Willard Nomad 30'
Join Date: Oct 2007
Posts: 15,787
W30 Blisters

Every few years I need to tend to quite a number of blisters the size and number as you can see in the pics. I've done this several times taking less than a day to fix. I grind out each little blister w my small had grinder to a depth of about 1/8th". Then fill the depressions w Epoxy. Had trouble the last time w too much hardener. Only had a minute or two to work as the epoxy would start to smoke and get very hot. I picked the wrong hardener thinking "in Alaska I'm going to need fast acting stuff. I consider the blister "problem" far less annoying than the AF painting and fowling of the bottom. I do that twice as often and at greater expense. Before someone asks I haven't bothered to determine if the blisters occur in the same place upon each outbreak.

Three pics,
!. The typical blister
2. Most of the below the WL was about this concentration re numbers.
3. The completed job before AF paint.
Attached Thumbnails
Click image for larger version

Name:	DSCF1097 copy.jpg
Views:	128
Size:	99.8 KB
ID:	73012   Click image for larger version

Name:	DSCF1098 copy 2.jpg
Views:	140
Size:	128.9 KB
ID:	73013   Click image for larger version

Name:	DSCF2265 copy.jpg
Views:	130
Size:	149.6 KB
ID:	73014  
__________________
Eric

North Western Washington State USA
Nomad Willy is offline   Reply With Quote
Old 02-16-2018, 09:42 PM   #13
Guru
 
City: Atlanta
Country: USA
Join Date: Jun 2012
Posts: 1,262
Wow dhmeissner a chill just went down my spine. Looks like Beirut
makobuilders is online now   Reply With Quote
Old 02-16-2018, 10:35 PM   #14
Guru
 
City: Port Townsend
Country: North America
Vessel Name: The Promise
Vessel Model: Roughwater 35
Join Date: Sep 2012
Posts: 1,563
Quote:
Originally Posted by Lou_tribal View Post
How old is your boat? Looks like a teenager lol

L
Not mine. I’d say the boat is between 30-40 years old. I’m not going to reveal the make. Some of those blisters are 3” in diameter.
dhmeissner is offline   Reply With Quote
Old 02-17-2018, 05:35 AM   #15
Guru
 
psneeld's Avatar
 
City: AICW
Country: USA
Vessel Name: Freedom
Vessel Model: Albin 40
Join Date: Oct 2011
Posts: 19,395
Heck, looks like my 1988 Albin 40 did after I sanded the bottom paint off all the way.

Spent most of her life in S Florida in a warm canal...which doesnt help and never had a dryout period...didnt come out for many years between paint jobs.

Surveryor mentioned blisters, but also said most were probably bad paint as they got smalker at the end of the haul period.

He like most must not have understood hydrolysis.
psneeld is online now   Reply With Quote
Old 02-17-2018, 08:57 AM   #16
Senior Member
 
City: Marion, Massachusetts
Country: United States
Vessel Name: Wanderer
Vessel Model: Pilgrim 40
Join Date: Sep 2016
Posts: 273
Fiberglas blistering is somewhat of a mystery as some do and some don't. It's hard to go back 30 years and determine if it was the formulation of the reside, too much catalyst, etc.

I first ran into this on a small sailboat in 1981. The correct fix cost was more than the value of the boat.

Fiberglas hulls leak, just very slowly.

The above pics emphasize the need for a good hull stippling now and then (every ten years?) to check on the hull.

In my area a soda blasting costs about $80/ft.

The layers that have failed have to be ground off. That pic at the top shows more than gel coat failure.

The removed layers have to be replaced. Tricky doing on a hull bottom. Sometimes they lay the boat over on its side.

Then you still have a mess, as the new layers are not really that smooth, so the hull has to be faired out.

Once you have a smooth hull again, it's time for a 4 or 5 coats of epoxy sealer before bottom paint.

Around $12,000 for a 40 footer if you have minor holes or blistering. I suspect the OP pic would be substantially more.
PMF1984 is offline   Reply With Quote
Old 02-17-2018, 10:45 AM   #17
Guru
 
psneeld's Avatar
 
City: AICW
Country: USA
Vessel Name: Freedom
Vessel Model: Albin 40
Join Date: Oct 2011
Posts: 19,395
the experts I believe that have the big picture, seem to think its the matt under the gel, on top of the rovings that is the evil spirit that wicks the water the fastest into a hull.

So I ground it all off before any repairs started.
psneeld is online now   Reply With Quote
Old 02-18-2018, 07:46 AM   #18
Guru
 
Group9's Avatar
 
City: Bay Saint Louis, Mississippi, (or where the anchor drops)
Country: USA
Vessel Model: 1973 42 Bertram MY
Join Date: Sep 2013
Posts: 675
I guess I have been lucky. A dozen fiberglass boats, and not a one with a serious blister problem. Worst was a Cape Dory that had three small ones, quarter sized, and one big one, about three or four inches in diameter. Last haulout, I had three or four, thumbnail sized.
__________________
Living life at one quarter speed.
Group9 is offline   Reply With Quote
Old 02-18-2018, 08:06 AM   #19
Guru
 
psneeld's Avatar
 
City: AICW
Country: USA
Vessel Name: Freedom
Vessel Model: Albin 40
Join Date: Oct 2011
Posts: 19,395
my 1977 Cape Dory ketch, hull no5 IIRC, had blisters all over one side...

another South Florida boat all its life... hope someone is getting the picture.... most even in the boating industry dont.
psneeld is online now   Reply With Quote
Old 02-18-2018, 09:56 AM   #20
Guru
 
twistedtree's Avatar
 
City: Gloucester, MA
Country: USA
Join Date: Jan 2013
Posts: 4,797
I thought blistering became well understood many years ago.

Polyester resin commonly used in fiberglass construction is NOT impervious to water. Very small amounts work their way into the material via osmosis, hence the term osmotic blisters. The water reacts with the resins to create the blisters and the stinky goo in them. Time in the water vs time hauled is a factor in the degree of blistering, as is water temp. Warm water with year round in the water is the worst.

The solution in equally well understood. Use a truly water impervious outer layer on the hull. Epoxy resins, and others are not subject to osmotic uptake of water. Some builders layup the outer layers with such a material. And using an epoxy barrier coat on the bottom is always a good idea too.
__________________

__________________
www.MVTanglewood.com
twistedtree is offline   Reply With Quote
Reply

Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

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





All times are GMT -5. The time now is 05:40 PM.


Powered by vBulletin® Version 3.8.8 Beta 4
Copyright ©2000 - 2019, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0
Copyright 2006 - 2012