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Hardcarve1 said..
I go to Clark Rubber and by the 5mm sheet that can be had in a range of colours and then using sand paper Glued to a thin strip of timber sand the grooves into the foam after its glued on the board. Mark out patterns in pencil and using a straight edge lightly sand the pattern in. Yes I'm cheap but money saved can go to my wife who tells me she can spend it better than me.
Clarke Rubber
wholesale SUP shop
Advection brand on Ebay is an aussie guys brand.
Kitepower has that WDFG(or something that sounds similar?) brand which is the best you can get at a pretty sweet price