I am a new user of Mr Surfacer 500. Let's say I am working on a wing / fuselage small gap. I would apply a few layer of Mr Surfacer, let it dry for a little bit, wipe the excess off with IPA / cotton swab, let it dry fully. Then at that point, I noticed that that stuff likes to shrink quite a bit. So basically, should I keep doing it for a few more layers?