Problems like this are often related to outgassing. Since the outside is already sealed, any trapped air can only get out on the wet side. If your boat is warming up it will tend to raise bubbles. Glassing in dropping temperatures will cure the worst of this sort of problem.

Also be careful that you don't over pull the cloth so it tries to bridge.

> Anyone else have problems with voids when glassing _inside_ parts of the
> boat?

> I can get it to stick on the outside great, convex curves and gravity are
> a great help. But when I try it on the inside I have to sit there with a
> brush and keep tacking down the parts that stick up, very aggravating.

> I know I could fix the problem by vacuum bagging it, but the trouble is
> the equipment costs as much as the boat!

> Brian C.