Spider Cracks, Osmosis and blisters.

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y2j

Petty Officer 3rd Class
Joined
Jun 12, 2003
Messages
89
Ok i got my good ole dremel out and i started grinding out all the spider cracks i have over the top part of my boat.. You could say i was doing 3mm Wide V's all along the spider cracks through the gelcoat until the epoxy. Unfortunately i painted my boat a year ago and it didn't stop the blistering problem because i didn't remove the blisters.. And i used a wrong puttty<br /><br />I was thinking this time of using normal epoxy 2 part and just filling up all the grindings i did of the spider cracks.. Just like filling a mold with plaster of paris.. Does epoxy bind to gelcoat? Or will i have to apply the epoxy and then apply another putty over the top and then sand prime and paint with my polyurethane paint?
 
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vegard

Petty Officer 2nd Class
Joined
Jun 7, 2003
Messages
168
Re: Spider Cracks, Osmosis and blisters.

epoxy binds to gelcoat, but not the other way around. ie. you cant gelcoat your epoxy repairs, but you can repair your gelcoat with epoxy
 
Y

y2j

Petty Officer 3rd Class
Joined
Jun 12, 2003
Messages
89
Re: Spider Cracks, Osmosis and blisters.

so if i putty up all the gelcoat grindings i had to do with a 2 part epoxy putty used for boats (im in australia so west system and all that aint here) And then sand it down then do the rest with a putty just to fair it out?<br /><br />Does epoxy bind to gelcoat very strongly so whne i fill the voids with epoxy and sand them down smooth then paint over with polyurethane they won't recrack and or shrink with time like my other putty's did?
 
H

Hooty

Rear Admiral
Joined
Oct 2, 2001
Messages
4,496
Re: Spider Cracks, Osmosis and blisters.

Epoxy will bond the crack of dawn to the break of day and using urethane over everything should work fine for you. A light sanding over the whole boat before painting is in order.<br /><br />g'luck & c/6<br />Hooty
 
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