Long story short:
I'm just about done refinishing a stock on an old rifle. I got Minwax
stain with matching Semi-Gloss topcoat. I stained it, and then put on
a couple of coats of the semi-gloss. After letting it dry, I lightly
sanded it with 400 grit paper to get rid of the raised grain.
Everything's fine, but I just changed my mind and decided to give it a
high gloss finish. I originally thought that multiple coats of
semigloss would amount to pretty shiny finish, due to my previous
experience with using acryllic gloss on plastic.
My question is this: Is it OK to do the final coats with Gloss finish,
even though the previous coats are semi-gloss?
Yes it will be fine but take note that the clarity of the wood will not be
as good as had you used gloss to start with. Generally you should always
use the gloss finishes and follow with the last coat as a semi gloss if you
want a satin or non gloss finish.
Treat it like a filler rather than a primer; cut it back to the bare wood.
Subsequent coats should look a million miles deep with a glass-smooth surface.
Resist temptation to build a heavy film. Deep always looks better than thick.
Thin 50%, apply with a rag, four coats, max.
A card scraper or razor blade will cut the old finish faster than sandpaper,
even on uncured poly, since it won't clog. A thin, flexible scraper is
preferred, since it can conform to non-flat surfaces.
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