It depends on the size of the model/airframe you have. Alot of the older control line models came with silkspan for covering & their wing structures were strong enough to be able to substitute Monokote in place of the silkspan. However, most of the rubber powered kits also came with silkspan & monokote potentially could crush or warp the structure during application. You didnt mention the type airframe you have, so just be aware that Monokote could produce the above mentioned results. I just finished applying Monokote to an old Mini Mambo kit and the monokote wanted to twist the wing during application. I got it done, but had my hands full keeping everything square. This was a kit that came with silkspan for covering.......Gene