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Fibreglass with a good thick coat of gelcoat. .. Mine looks as good as new after a year or so. Also a mate of mine is a fisherman and he has done the same..you can imagine the crap that gets chucked in the back of his van (all covered in salt water) and his is fine too.
Probably best to have a measure up or the floor area then email the supplier. If you need a link to the guys I used let me know and I'll sort it out for you tomorrow ..