Need to spray-paint or varnish a raft of trim pieces for that bedroom remodeling job? Here’s a cushy way to finish pieces without rotating or repositioning them. Cover a sheet of extruded polystyrene ($10 at a home center) with 1-mil painter’s plastic. (Spray paint will eat away at unprotected foam.) Now stick crisscrossed nails into the foam to hold up the pieces, then line up the trim and start painting. Thanks to Tom Lant for this great tip.