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Hi Fakim
I have used both polystyrene and closed cell foam to line wooden boxes that I built for OTA’s and mounts. I now prefer closed cell foam. Closed cell foam is chemically blown so it does not absorb water like a sponge with its open pores.
In Brisbane I found a foam dealer who stocks different types of foam and ended up choosing the dense black version. 25mm thick for my mount and 10mm thick for my OTA.
The shop had a special glue (=expensive) that was formulated to prevent kids from glue sniffing and the owner suggested leaving the finished box open for a day or two just to make sure any lingering fumes from the glue evaporated.
In the end, I left the box outside, under the patio for over a week and I have not had any problems.
Good luck with the project.
Cheers
Dennis
PS – the next grade down from the high density black foam was a blue coloured foam that felt spongier between my fingers.
PPS – I used a very sharp retractable blade knife and a steel ruler to cut the foam.
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