Probably a bit late but if you have a stock with a really tough varnish, don't try sanding it immediately (or use paint stripper).
Those thin flexible $2 shop paint scraper type dealies with the corners/any burrs sanded off work like magic.
Had a stock that just instantly clogged even high quality coarse paper, dragging the scraper lightly in one direction just tore through the polymer gloss coat without damaging the surface (some care and attention required).
Then sanding was a piece of piss. And no more clogged paper.
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