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conversion varnish cure failure8/9
I've just applied a third coat of SW's water white conversion varnish, rubbed bright. And it did not cure completely overnight in hot conditions. Looks great, but is tacky. I think most likely it is because of a weak catalyst addition. This stuff is based on 3%. Does anybody know if applying another coat with a "hot" coat, like 4% and of course, no prep is possible. Please, Please help! I have to do this today. I have a small, small scrap with the under cured product on it. (so it isn't related to too much thickness. Ken
Before I would spray a hot catalyst batch I'd try to spray a thinner catalyst mixture on the tacky finish to see if it would cure. Then spray a normally catalyzed coat.
What kind of coat thickness do you have now? What does SW recommend on that material? You may have exceeded factory specs without adding even more. I don't think anyone sprays 4 coats of CV.
Why do you think adding more catalyst to the next coat will help? Do you think it will make the coat that is tacky cure? You can apply another coat and hope it cures and it should if your catalyst is correct. But down the road in about a year or two, the finish will start to crack. Have seen it too many times.
In response to the most recent posts to this thread, the hotter coat did kick off the uncured underlaying coat; enough so that I could agressively wet sand the entire piece with 400. I usually go for 3 coats due to the fact that most of my projects are onboard boat interiors and the fact that I do sand pretty well between coats due to a less than perfect spray "booth". :) Thanks all!
What exactly does "kick off the uncured underlying coat" mean? The coat that was soft is not curing at the same rate at the one over top. It will cure and when it does and the one over top has been cured for some time, it will cause the last coat to crack. How on earth do you know the coat in question is cured? How can you say " the uncured underlying coat" is curing if it is soft?