Hello, I recently purchased an oday 27, It's been in drydock for two years and needs bottom paint. I sanded off the old remaining bottom paint, hidden underneath were about 200 little blisters from pinhead size to pencil eraser (3 centimeters). They're all below the waterline and predominantly on the port side (maybe 10 total on the starboard side). I was wondering, would a hull thats been in drydock for two years still have active acid working in the blisters? I've used a dremel tool to grind about half of them and they were all dry, however I rinsed them anyway. Should I do all of them or has the osmotic action ceased to react. Also, why would they be on one side of the hull and not the other? Does it help to rinse them out with baking soda? Any simular problems, any recomendations? I plan to fill them barrier coat and bottom paint with interlux.
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Blisters
Maybe the guy who laid up that side of the hull had a fight with his girlfriend the night before. Who knows! Blisters of that side are mainly cosmetic but since you've started, you might as well go all the way. Grind 'em out till all the bad glass is gone, wipe them out thoroughly with acetone and then barrier coat them. Personally, I would avoid putting water on them - you don't want to get the glass wet again - but I could be all "wet" on that point. ;-) Should you do them all? Why not? If you don't, they *probably* won't get any bigger but if you do, at least you know they're done & won't worry about it. LaDonna
Maybe the guy who laid up that side of the hull had a fight with his girlfriend the night before. Who knows! Blisters of that side are mainly cosmetic but since you've started, you might as well go all the way. Grind 'em out till all the bad glass is gone, wipe them out thoroughly with acetone and then barrier coat them. Personally, I would avoid putting water on them - you don't want to get the glass wet again - but I could be all "wet" on that point. ;-) Should you do them all? Why not? If you don't, they *probably* won't get any bigger but if you do, at least you know they're done & won't worry about it. LaDonna
blisters
You do want to rinse the prepared repair areas with water to help neutralize the acids. You can then use the acetone to chase the water.
You do want to rinse the prepared repair areas with water to help neutralize the acids. You can then use the acetone to chase the water.
Look up to Fiberglass Trilogy III (A & B)at top
La Donnas comment about different workmanship ofn each side of the boat may be relevant, but I think it is more likely that that was the "sunny side". This certainly happened with my boat in HI. Since bloster occur faster in warmer conditions one would expect the wamer side to blister faster. Your blisters seem mainly of the "rash" type- not really bad. You do need to rinse with water- its not like soaking the boat in water. I think that you will find all this - causes, myths, and repair in the Fiberglass trilogy at the top of this page. It summarizes everying I have read, seen ( in person an on video) plus input from a survey of readers on this site. Thanks JW
La Donnas comment about different workmanship ofn each side of the boat may be relevant, but I think it is more likely that that was the "sunny side". This certainly happened with my boat in HI. Since bloster occur faster in warmer conditions one would expect the wamer side to blister faster. Your blisters seem mainly of the "rash" type- not really bad. You do need to rinse with water- its not like soaking the boat in water. I think that you will find all this - causes, myths, and repair in the Fiberglass trilogy at the top of this page. It summarizes everying I have read, seen ( in person an on video) plus input from a survey of readers on this site. Thanks JW
One sided blisters might be caused by
the boat sitting in the same location and the sun hitting that side all the time and not the other side. I have heard that *potentially* this might cause the water, etc to get warmer and warmer water might increase the rate of some types of blisters.
the boat sitting in the same location and the sun hitting that side all the time and not the other side. I have heard that *potentially* this might cause the water, etc to get warmer and warmer water might increase the rate of some types of blisters.
Thanx
Thank you, for your responses. Since posting, I've read the "gelcoat and blister trilogy". I also talked to Some of the fiberglass folks at my Marina. They pretty much told me the same thing, "Hell, those are so small I would'nt worry about em" and "I'd just sand em flat and coat em with a good barrier coat before ya paint, they're all dry anyways". So much for worrying!!! Again thanx for the help
Thank you, for your responses. Since posting, I've read the "gelcoat and blister trilogy". I also talked to Some of the fiberglass folks at my Marina. They pretty much told me the same thing, "Hell, those are so small I would'nt worry about em" and "I'd just sand em flat and coat em with a good barrier coat before ya paint, they're all dry anyways". So much for worrying!!! Again thanx for the help
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