Turn a fiberglass board into a soft top

Has anyone tried to make their board into a soft top, or seen any thread or site where they do it?
I have a board that I kind off just use at the shorebreak and would like it to be soft so its less likely to hurt myself or anyone else. Also I just got it to challenge myself for fun to paddle and surf it. It is tiny volume and I wouldn't mind the extra centeliters a layer of foam would give.
Might post a pic of it later but here are the dimensions:
5'5" x 18" x 2 1/6 " -- 21.5 liter
Maybe I could just get a roll of eva foam, cut it, glue it on and cut neatly by the rails? Problem here seems to be get it neat enough? I have seen on other soft tops that they have the foam to create a sharp edge towards the bottom, but since the rails are round it's har to visualize how it would be on my board if I put foam all the way around the rails. Maybe try to put a layer of glass on the bottom afterwards to make it transition from the bottom to the foamy rail nicely? I have no experience with glassing though so probably wont happen.
Also note that this board has already seen its best days, so I don't really care about it, just want to experiment with it.
What to look for when buying the EVA foam? Are they all waterproof? Thickness? Thinking 2-5 mm something. What is a strong glue (and cheap, would use a lot to cover the whole top).
I have a board that I kind off just use at the shorebreak and would like it to be soft so its less likely to hurt myself or anyone else. Also I just got it to challenge myself for fun to paddle and surf it. It is tiny volume and I wouldn't mind the extra centeliters a layer of foam would give.
Might post a pic of it later but here are the dimensions:
5'5" x 18" x 2 1/6 " -- 21.5 liter
Maybe I could just get a roll of eva foam, cut it, glue it on and cut neatly by the rails? Problem here seems to be get it neat enough? I have seen on other soft tops that they have the foam to create a sharp edge towards the bottom, but since the rails are round it's har to visualize how it would be on my board if I put foam all the way around the rails. Maybe try to put a layer of glass on the bottom afterwards to make it transition from the bottom to the foamy rail nicely? I have no experience with glassing though so probably wont happen.
Also note that this board has already seen its best days, so I don't really care about it, just want to experiment with it.
What to look for when buying the EVA foam? Are they all waterproof? Thickness? Thinking 2-5 mm something. What is a strong glue (and cheap, would use a lot to cover the whole top).