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Posted

I accidentally stepped on this Challenger body ,which broke into five pieces.I was able to glue it back together but I had to glue some panels on one side and allow the glue to cure so that it would be in proper alignment when glued to the other side.I  laid down the putty and will wet sand it then primer it 

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Posted

As long as, when the body is ready for primer, no plastic-to-plastic joints are at the surface, you should be okay.  Any such joints should be routed out and two-part automotive spot putty or epoxy putty applied to those areas.

Posted

The 3M, like most/all one-part spot putties, are essentially extremely thick lacquer primer and dry via the evaporation of the solvent contained in it.  It needs to be applied in extremely thin layers with each layer getting plenty of time to dry.  Otherwise it will continue to shrink through continuing evaporation of the solvent.

For major repairs or filling deep damage, two-part epoxy or spot putty would be easier to work with.  Two-part fillers cure via a chemical reaction with no shrinkage afterwards.  Once it's cured, it's cured, and it won't shrink afterward.

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