Is it just my imagination or is my 'Kingspore' brand waterproof sand paper
leaving black marks on some of my work? Ok, I know you can't see it!
However, I've been working with white birch and it sure looks like it's
darker in spots after I've sanded it, both dry and with a blo/thinner mix.

How does the 'dark red aluminium oxide' waterproof paper perform and will it
leave a stain?

--
Tom in Qualicum Beach, BC