I put on some poly on an oak project I am working on and it was fairly rough from dust nibs and such. I read once about wet sanding between coats using mineral spirits. I have dry sanded before and got lots of corns, so I thought I would give it a try. It worked great, but left a white, slightly oily, powdering residue (as I expected). It all wiped off ok, but some is in the grain of the oak and it won't come out. I tried blowing it out with an air compressor and it won't budge. Any tips on getting it out? If I put another coat on top of this will it still be visible?
I would also be interested in whether there is a better technique to smooth out poly between coats. Thanks!