Reply by DrDirt

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Posted on Varnish and rubbing out

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4614 posts in 4591 days

#1 posted 08-03-2016 08:23 PM

You may be allowing ample “dry” time, but 1 week or 2 weeks is not enough “cure” time for OB varnish, not with enough film thickness to get a “piano” gloss finish. 30 days minimum in a hot garage will do nicely. The less time it s allowed to cure, the more likely the grain will telegraph through after a few months. Let it dry a few days and do a “rough” sanding with ~400, if all looks good, set it aside for another 3 weeks or so, then finish out.

I much prefer spraying WB finish when doing a fully filled finish. With the poly I use, additional coats burn in for 24 hrs after the 1st coat, so no knit lines to worry about. The WB lacquer will burn in anytime, just like solvent lacquer.

- OSU55

But if you are ‘burning through’ 8 coats, while wet sanding with 400 grit.. semms there must not be much of a layer.
I would test “dry sanding” with 400 and see if you get white powder… of if your paper is all filled with corns.
If it is powder – it is cured enough to rub out.
I have never needed more than 7 or 8 days for varnish to cure enough to level… indeed it will continue to cure and polymerize/cross link for a month..

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