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Author Topic:   Help!! gel coat question.
bmacauto posted 06-09-2001 10:35 PM ET (US)   Profile for bmacauto   Send Email to bmacauto  
I have very small bubles in the stearn of my 84' outrage 18. You can pick open the bubbles with your finger nails though, they don't seem to be gel coat, maybe paint of some sort? The holes only go to the fiberglass, and one had a drop of water coming out, but i dont see or feel any soft spots. Any ideas what this is and the best way to fix it? Thanks
Paint Legend posted 06-15-2001 04:14 PM ET (US)     Profile for Paint Legend  Send Email to Paint Legend     
I am guessing it's below the waterline??

If so it's osmosis and you need to fill all blisters and either re-gelcoat or apply a water barrier paint system.

Best regards,

bmacauto posted 06-15-2001 07:44 PM ET (US)     Profile for bmacauto  Send Email to bmacauto     
Actauly, it's above the waterline. Very odd, the rest of hull is in perfect condition... The holes look almost drilled, very round and clean cut, and maybe painted over... but they don't breach the fiberglass... Any other ides? Thanks
vinay posted 12-30-2006 10:00 PM ET (US)     Profile for vinay  Send Email to vinay     
If the bubble are above the water line, then it is not osmosis. Many other factor can create those bubble. Good news is that it should be easy to fix. Opening the bubbles to expose the glass is the fist step. Rinsing with fresh water and drying is important. Seal with epoxy (any would do but they make specialize ones these days that have more absorption) Then refinish the color finish.
If the boat is osmosis free under, and if the boat spends its time in the water mostly, it seems to me that it would be a good time to epoxy the bottom. Even an antifouling epoxy would put you miles ahead.
Don't forget that all blisters have to be 'opened' , 'cleaned', and 'filled / faired'
vinay posted 12-30-2006 10:07 PM ET (US)     Profile for vinay  Send Email to vinay     
I forgot to say that those bubbles can easily have come from the gel coat itself! When the gel coat was mixed, (or this area repaired by the manifacturer after because of some aestetic apearance) it may have been mixed to hard, introducing small air bubbles (same process as wipping cream). Those bubbles dry-up and harden and eventually brake due to water vapor, sunlight / heat, hull cleaning agents etc... So you have nothing to worry about in my humble opinion
filthypit posted 01-03-2007 02:13 PM ET (US)     Profile for filthypit  Send Email to filthypit     
if the gelcoat was sprayed on postproduction, it might be from a lack of moisture filter/barrier on the compressor used to spray it.

we sprayed a gelcoat in august (VERY humid) and had a slight problem w/ a few water droplets in our gelcoat. it was because we were using a brand new air compressor without any water filters installed. but, since we sprayed three coats, it was easy enough to sand off any minute bubbles/pinholes once it hardened.

good luck!

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