Osmosis (i think) Problems with my boat.

y2jericho

Petty Officer 2nd Class
Joined
Aug 30, 2002
Messages
146
Well i finished repainting my boat about a month ago. It has not even seen the water yet. After about 3 days i realised a bubble appearing on the hull so i chiselled it (yes i hated doing it to) .. Sanded it and painted it with a brush mixing a little of the 2 pac poly paint. Then i sanded it and buffed it up ... Noticable but still better than a bubble. Now i realised on the back of my boat near the grip pads on each side of my transom.. The right side where the grip starts the paint has bubbled and cracked and there is a very smelly (like petrol and old oranges) brownish semi clearish liquid coming out. Looks like tree sap.... And after climbing under the boat i have noticed 5 bubbles about the size of bottle caps lid (some a bit bigger) forming all over the bottom. I can't push them in but people havet odl me they are just air bubbles. And on the very tip of the bottom there are 2 bubbles which have popped and the same kind of liquid is seeping out as on the grip pads<br /><br />I spent over $1000 into restoring this boat and im nearing the end now and very dissappointed in the paintjob because of this and I was so happy the boat turned out exactly as i had thought of it in my mind... Thanks
 

Bob_VT

Moderator & Unofficial iBoats Historian
Staff member
Joined
May 19, 2001
Messages
26,065
Re: Osmosis (i think) Problems with my boat.

Hello mate. It does not sound good. I would suspect when you initially sanded the hull the fiberglass became porous. This is combined with the fact that you might have moisture in the hull.<br /><br />One suggestion is to explore the wood stringers in the hull and the tramson for rot. A possible solution if it is just moisture is to flip the hull over (hull side up) and place some heat source under it. I would leave this go for as long as possible.<br /><br />Bob
 

y2jericho

Petty Officer 2nd Class
Joined
Aug 30, 2002
Messages
146
Re: Osmosis (i think) Problems with my boat.

The boat is rock solid in my view<br /><br />The floor has been re glassed everything about 9 years ago. But its been kept under a roof and is 100% rock solid. I just found out that the hull plug is not correctly placed and water seems to fill in undre pressure when the fish tank at the back is full. I just opened the plug and through 3 days all the water came out and none seems to be comeing out more. In australia here we have very hot weather... Just today it was roughly 30c degrees. Soon it will be 35-45c... If i leave the boat like that shouldn't it dry out soon or later? (the cork has been open for about 2 weeks under hot weather the boat gets pretty hot on the inside......... <br /><br />I also found this information<br /><br /> http://www.givemeweb.com/bwmw/library/fibreglass.html <br /><br />OSMOSIS Fibreglass Topics <br /> Osmosis is not something that is found only in GRP or Fibreglass boats. It is a process where solutions of different densities are drawn through a permeable material, usually the weaker solution to the stronger solution. It happens in timber as well as fibreglass but is less of a problem. It can and often does occur in fibreglass fresh water tanks, an area often overlooked in surveys.<br /> In laying up fibreglass boats often small pockets of uncured resin get trapped in the laminations. This draws in moisture from the outside or the bilge and as a result more resin is dissolved and so the process goes on. A build up of pressure can cause further delamination to the extent that a structural weakness may develop. The familiar blister on the outside of the hull is a sure sign, but the only real test is to locate the presence of moisture in the laminations. Fortunately there are now instruments that can detect moisture in the laminations that is not noticeable from inside or outside the hull. When slipping your boat a quick run over with a moisture meter will detect trouble spots.<br />This will also identify those many small blisters caused by trapped air and whilst not osmosis, they will eventually cause trouble. A true osmosis blister, when pierced ejects a pungent acidic liquid, under pressure - so do so only with appropriate eye protection.<br /> Osmosis is curable. If small and isolated spots are found, it is not expensive. However, if moisture is found in many places even though it may have not developed the familiar blisters, early treatment will be less costly in the long run. Even if a hull has no evidence of osmosis, a full treatment with a barrier coat can be good insurance.<br /> A leading UK authority on osmosis (Tony Stanton-Bevan) has found that 70% of the thousands of vessels he has surveyed had developed osmosis. And that is in Britain. It occurs at a higher rate in warmer climates <br /> <br /><br />^^^^^^^^ Bingo<br /><br />I guess ill leave it be ... The holes have stopped seeping out the acidic liquid and i have painted over them.. If they start up again i have a problem and might sell the boat and start fresh this time having much experience from my first boat etc.. But its a costly lesson not really involviing the $1000 US i spent but the months of work<br /><br />Lifes a bi*ch then u die ;(
 

crab bait

Captain
Joined
Feb 5, 2002
Messages
3,831
Re: Osmosis (i think) Problems with my boat.

that's a cryin'shame... i'd let it dry in that aussy heat ... and patch the holes with an epoxy putty.. than use 'her' ...<br /><br />if you got a little more time ,,, rough up the paint an paint on a product called 'GLUVIT' .. it's an epoxy barrier coat.. <br /><br />it's available here at west marine dot com or boat { boats} u s dot com...
 
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