did you wash the shell out 1st? the shells usually are sprayed with a release agent so they come off the mould & if you don't wash it off properly (i.e. warm soapy water & lots of it) then nothing will stick to it very well.
Another factor is did you use Tamiya PS paint?
Also the Fastrax paint & the Tamiya paint are pretty much identical (some people even say it's the same stuff).. except the fastrax paint is usually a quid cheaper & you get more in the tin!
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