Making fuselage formers

Say, that is a neat trick.

See here: https://youtu.be/WPQq3KHVC1A

And be sure to check out the rest of Paul Budzik's videos. Together they make a complete course in all aspects of model building.

I suppose you could do the solder trick, lay it on paper and hit it with a shot of spray paint.

I'll pass on a tip I use, learned from some '80s-era modeling magazine...might have been the old Scale Modeler or one of the IPMS/USA publications.

Use the thin styrofoam from foam-type egg cartons. All you have to do is rough-cut a blank of the approximate size...slightly larger is ideal...then just pop it in and glue with PVA or some other non-solvent adhesive. The foam neatly compresses to perfectly fit the contour with virtually no bulging or mis-shaping (if that's a word). Best to paint with acrylics; I occasionally tried the old Testors 'square bottle' enamels (my go-to during those years), which usually had no effect...but sometimes would start to corrode the material over time.

BTW, if you're of a curious nature, and have never tried it, 'test' any solvent adhesive or regular tube glue on egg-carton foam: it eats it away before your very eyes, just like acid. Definitely not recommended for modeling work.