Im doing 2 flatdeck conversions on a 440 and 550 can i use 2lb density foam or should i get 4lb? whats the advantages ? is there any other foam i can use?
I'm running 2 layers of biax with 3 where my feet normally go and I only used polystyrene with no expanding foam (so basically no fiberglass reinforcement). I've had no problems yet and for flatwater use, I beat the crap out of my ski.
you add weight as you add strength. its a tradeoff. if you add more glass its still adding weight and strength. I would use 2lbs everywhere and if you are worried just pour the 4 in the spots you will stand in.
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