I love Sig Koverall and use it up to 1/4 scale. Just follow the factory instructions.For 1/3 scale and up, I use polyester dress lining from JoAnn fabrics, it's very similar to koverall, but a slightly heavier weave.Iron only to shrink the fabric - no heat guns allowed.Fill the weave with dope,modgepodge,polycrylic minwax, Lustrekote paint sticks to it great!Happy doping! John R.

www.rcaircraftworks.com