Super Jet cutting back sn -3, can i refoam thru there?

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Pa
so i traded for this sn last summer, has perfect turf but water in the tray. i want to refoam to get this water situation handled and i also want to chop it 3-in in the back so why not do both, if i taper the hull real smooth for my layup can i get away without re-inforceing it from the inside, just layup from the outside? it seems like it would be pretty smooth going to defoam that way. its gonna get the piss surfed out of it.
 
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