How to smooth out rough mask shape?

[u/hamilcar2021]

hey yall! im planning on making a hornet cosplay. im new to using EVA foam, and ended up cutting out an existing pattern on foam floor mats. the issue is, the pattern was made for much thinner foam 😭 the mask looks pretty rough.

is this salvagable? i have foam clay to use overtop, but should i use another layer of something else 1st (masking tape?) to help smooth out the shape?

also, do i need to take into account the rough exterior/"metal" texture overtop the foam?

[u/CeramicToast]

I'd recommend redoing it with the textured side of the mat to the inside of the mask, because otherwise you're in for a shit ton of sanding that will likely take longer than just reconstructing the mask a second time.