Ok, I guess the best plan is to just stick with .7oz cloth for the best surface for fill and finishing and not smack the surface with anything.
Here is another question.
How would a 1/8" balsa sheet fuse side laminated on both sides with .7 oz cloth and epoxy resin compare with the same fuse side made from poplar light ply in weight and strength?
Is there any advantage to using the laminated balsa sandwich to plain light ply for strength and weight?