I get that with every kit I do (even free paper models).
I have found a cheep-effective, and non-destructive methood (Put the Dasy Red-Ryder Down!)
Just put the kit back in the box (or in a box, if it won't fit) and then start working on another kit. Once you get sick of the new kit, go back to the first one, and repeat untill both kits are done. Now I'm cranking completed kits out fast enough to warrent a monthly trip to the hobby shop (yet mom won't let me)
***NOTE: It won't work for restoring an old car. Once you get one, your stuck with it once you tear into it. After you remove the body, it will be immoble unless you own a flat bed truck (even then, it will be stuck on the truck, so you'll have to do all work on the back of the truck)