I have been using Koverall for years with great success. I use nitrate dope to stick the fabric to the structure and to seal the weave. Butyrate dope for the color works well as do epoxy paints.

A few other points:

1. Instead of trimming the koverall with a blade, try a sanding block and sand away from the surface. This trims the fabric and helps to feather the edge so it is not as visable.

2. It has always been my understanding that Nitrate dope does NOT continue to shrink over time but butyrate dope does. In any event you can buy non-tautening butyrate dope or you can add "flex-all" from Dave Brown Products.

3. Mix talc with nitrate dope for a cheap light weight filler. 2 coats with a little elbow grease and a sanding block will yield a near glass smooth surface. Micro balloons may work even better but I haven't tried it.

4. On sheet balsa surfaces try silkspan applied with nitrate dope instead of glass and epoxy. Much lighter, fills with only a coat or two of dope and sands easy.

Properly applied, Koverall coverall adds no more weight than monokote but is much stronger and will last for years without bubbles or sags. It is initially more work to apply but much less work to maintain.