but you should seal with resin/glass/filler your cut outs so if water does get in it won't get inbetween the gel and 2'' of coring and rot out the transom. I found out saber does that, baja did not but mine was dry when Iput a hp gimbal on it and we coated it with resin fiberglass filler same with exhaust holes and hatch cut out after we had to re balsa part of the deck so if water gets behind the hatches it won't get in the coring again thats on the baja. saber seems to take the extra step.