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Subject: Re: 2nd topcoat applied just after 1st coat flash with CV - inferior?

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Message Thread:

2nd topcoat applied just after 1st coat flash with CV - inferior?

3/5/18       
pdub Member

I know there's 2 schools of thought here, so I want some opinions. This is specifically for the use use of CV or other "non-burning" coatings.
In my view, putting on the 1st topcoat (after cured sealer coats) and then waiting a few minutes for it to flash and putting on the final topcoat seems to yield an inferior finish. 1st because you don't get to have a final look at the surface that now has a little gloss (even at 10 sheen) and see the last round of imperfections to sand out. Also, I wonder about the bond between the 2 coats. Typically, CV has a mechanical bond. So how good is it if it's burning in to the previous coat? It looks too thin to me.
What y'all think?

3/6/18       #2: 2nd topcoat applied just after 1st ...
Shane

In my opinion it's acceptable to recoat after a short flash off if you can accept the fact that in your quality/time budget. The second coat after flash off is not going to affect adhesion and in fact is going to chemically bond. On the other hand if you allow that first coat to dry and scuff sand again and eliminate any other defects your end result is going to be a flatter surface with less defects because you massaged it a bit more and gave it more attention. Both schools of thought are acceptable.. It comes down to how much detail you want to have with your end result. Where I work quality is valued more than quantity.. if we don't feel it's up to snuff we either : A-- push it back to the department before us and call them out on a quality reject or B-- we fix the issue if it's from our overlooking the issue or C-- the QC/shipping dept. calls us out on something not up to snuff.... Checks and balances across the organization

3/6/18       #3: 2nd topcoat applied just after 1st ...
nick

i agree with Shane; getting in one more sanding/scuff means you'll get one more chance to catch and smooth out that spec of dust or rough inside corner.
that said I've been spraying more 2k poly(MLC Polarin) lately and with the shorter pot-life but longer to sand times I have often been going to the wet on tacky coat when using it and finding that I can get great results that way too...as long as I pay lots more attention to that one sanding and dusting.

3/18/18       #4: 2nd topcoat applied just after 1st ...
Mike Fuson

I used cv as a self seal system for years and always got better results if I let the previous coat completely dry. These days I’m using vinyl sealer which dries much faster and am getting better finishes in the end but with an extra step.

 

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