I brushed on a coat of satin poly on a walnut box without any problems and then sanded with 240 grit paper and then brushed a second coat. The second coat dried slowly and several drips formed at the bottom of the vertical sides. I am sure that I can sand these out, but is there an easier/better way to get the "big pieces" off? Perhaps with a sharp chisel or small hand plane?
Also, how old is too old for polyurethane? This can was opened in Sept 2008, but showed no skinning or turbidity. It seemed to dry too slowly.