Just a little strange

[sailaway78]

A lot of faith

Hermit, you have a lot of faith in advertising. Says waterproof on the can and a picture of a boat. Have you ever heard of:Liar:. Like you I would like to know a lot more about blisters. I do know that many "experts" have nearly as many different opinions as there are experts.
Most of the ones on my boat are very very small, straight pin size. I talked to the marina guy, who has probably done more of these than many of the so called experts. He says that he would just put bottom paint over them. There are so many that the only way to fix it would be to take the entire area down to the gel coat, then trowel it with some filler, and then do a barrier coat. All this of course assuming that the hull dries out within the next however many days, weeks, or months. So, it is going to get bottom paint. Next time out, if they are bigger or more pronounced, will take some other action.

 

[sailingdog]

Hermit-

If you can post a link to the resin you used, I'd be interested in seeing what it is...

 

[Hermit Scott]

Resin

It amazes me that there is no consensus on this. I think I am going to have a witch doctor drill some holes in the hull to let the evil spirits out of my boat.
Nice and Easy, I was really just kidding about the picture of the boat. It seems to me anything with a picture of a boat triples the price but rarely the quality.

The resin is sold at Lowes in the paint and chemical department. STYRENE MONOMER
Searching the internet I found something about vinyl to do with it.
http://www.elmers.com/products/msds/me770.htm this is the material data sheet.

 

[sailingdog]

You're using all-purpose fiberglass resin from a home repair store to make repairs on a boat???

I don't know whether that is a polyester or vinylester resin... Elmer's doesn't say much about it other than having the MSDS posted. Based on the price, it is a polyester resin—Vinylester resins are more expensive than Polyester resins. IIRC, styrene monomer is often used to thin standard marine polyester resins. My guess is that this resin is probably more permeable than standard marine polyester resins would be, since the greater the styrene monomer content, generally the more permeable the resin is.

Another problem with using either polyester or vinylester resins on repairs and re-lamination is shinkage. Most polyester and vinylester resins shrink about 5-9%, epoxy resins usually less than 1-2%.

Good luck with your repairs... there are some places where spending the money on known goods for a given purpose really make sense... resin for repairing a boat is probably one of them.

BTW, IMHO, the degree of "waterproofness" that is required for a household item, say a bathtub or shower enclosure repair, and that of a the hull of a boat that is sitting in a slip for over six-months a year are significantly different. What may be "waterproof" in the context of a 15 minute shower per day and then having 23 hours and 45 minutes to dry out, versus sitting in water 24/7 for six months is quite different. If this were not the case, you could probably wear the same "rain coat" that you walk about in during spring showers when going from the office to the coffee shop, when out sailing in Force 7 winds and near gale conditions... instead of having dedicated foul weather gear for use on the boat in those conditions.

 

[Hermit Scott]

resin

It said it can be used on a boat or on a car, because it doen't shrink and it's waterproof. It's fiberglass resin, I don't think there is anything mystical about it. I'm sure it's better than what the rest of my boat is made of.
If you run across any factsabout this stuff let me know. Thanks for the guesses though. I may call them to see what it really is though.