I'm trying to apply a tiger stripe finish to a guitar with a maple veneer top. The guitar had a thick coat of sanding sealer applied from the factory that I've been battling to sand off. I'm not sure if I've removed all of the sealer because it is transparent. Is there a way to test the veneer to see if I've thoroughly sanded and it will accept the stain evenly (with water or mineral spirits or something non-permanant)?