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MM Red Putty isn't bad as far as putties go, but they all have a couple of problems. They shrink when they dry (meaning sometimes multiple applications), you have to wait while the solvent in the putty "gasses out," they don't work well on resin, and they tend to soften thin parts, especially vacuform plastic. Ross' suggestion is the answer to a modeler's prayers. Auto modelers have evidently been using it for years to do custom countour changes. (I sent you a scan of the original Fine Scale Modeler Tip article, where I got the "recipe").
"Supafilla" (my name for the concoction) has none of putty's disadvantages, and it's cheap! When dry it actually adds structural rigidity, so it's great for gap filling. One word of caution: since it doesn't shrink, apply just enough to fill the joint, ejector pin mark, etc. The more the build-up, the more you'll have to sand away. Hth, Rob
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