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If the liner is EPS, the solvents in spray paint will probably degrade it - if it is EPP then it should be more solvent resistant but many paint types will bead rather than cover.
The hard shell might be ok with a suitable plastic primer and much masking (see above) but I wouldn't.
With any luck someone with a greater understanding will spot this and post a better answer for you.
MrE
Managed to score a POC enduro helmet stupid cheap in the wiggle fire sale. It’s cheap because it is a tasteful shade of pink. Would spray painting it a different colour a massive no-no? If not, any advice on best paint/techniques to use?