Here is my situation. I have a Sig 1/6th scale Cub that has been covered with Sig Koverall and Stix-it. Next to seal the fabric I am brushing on Clear polyurethane. How many coats of polyurethane will I need? Once the polyurethane is on, do I need to add primer before I paint it with Lusterkote? What kind of primer? Once the Lusterkote is on, do I need to add a clearcoat over it and the decals? If I spray the clear-coat on, will that be enough? Thanks for the help.

BCP

This looks like new territory. The standard sealer for Koverall has been nitrate dope, three coats or more, depending on the builder's wishes. I think the Lusterkote line includes a primer-I would use it if available. HOWEVER-a warning from several peoples experience (I have not used the product). There have been numerous reports of cans of Lusterkote that fail to spray properly and some reports of colors (red that I am sure of) that faded badly to a strange black color after exposure to the sun. Build some test frames and try your combination before committing it to the plane. Better to find out something isn't compatable before you have to clean up an airplane.

BTW, you likely wouldn't want to overdo the filler on a Cub because the fabric texture normally shows in the paint. Monokoted Cubs look strange because they are too slick.

BCP:

The only Lustrecoat spray I've had problems with is the white, but that's not your problem, now.

The polyurethane has limited your choices, many kinds of paint can't be applied over it due to solvent reactions. Also, sealing the fabric with nitrate dope keeps it tight due to the constant shrinkage of the nitrate.

What you need to do now is make a test panel, just an open frame, and cover it with the Koverite and seal ir as you have done the plane. You can try different paints on it to test compatability.

Next time, use nitrate.

Bill.