I personally would not use these hooks on the marine fabric. The core weave/threads of the material would weaken and there goes your coffee mug or what have you, dangling by a thread. Not enough substrate to adhere to. Furthermore, I wouldn't want to thin out or otherwise cause a bare area in the marine fabric from the repeated stress of trying to hold something up.
I have those hooks on my
fridge door and find that suction cup hooks have worked well on FG interior for other little doo dads.
Sent from my iPhone using
Fiberglass RV