Glueing to the hull

Whenever I have glued something to the inside of my hull I end up with a slight ripple on the outside after a month or so. I assume it is caused by the epoxy bead shrinking. Is there any way to minimize this?

Yes, working with thin lay-ups.

Only way I know how, is to do all my building first (secondary bonds), then when all done, do the hull fairing last. Shrinkage, and heat distortion from exotherm, will just about always ripple the thin lay-ups.