How to tell whether a board is EPS or PU?

General Discussion
21

Drill a big hole in it. Pour Acetone in it. If your surfboard disapears then it’s EPS.

22

Hi, hope you can help me out on what type of foam is in my board so i can try to fix it(see pic)

thanks in advance! cheers, willem

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23

[quote="$1"]

Hi, hope you can help me out on what type of foam is in my board so i can try to fix it(see pic)

thanks in advance! cheers, willem

[/quote]

A.) looks like polyurethane foam to me

B.) go back and re-read thread starting from first post

24

will do, thanks!

25

If it were me I’d patch that square.  Sand the whole tail corner down.  Tape it off and apply some 4 oz. to the entire spidered area.  Cuz it’s gonna suck…water if you don’t.  Mike

26

thanks mike, I’m afraid this not the only problem area on the board, for example the nose is delaminated, the rails are split at certain spots.In general, where do you usually use 4 oz and where the heavier fibreglass? many thanks, willem

 

27

[quote="$1"]

thanks mike, I'm afraid this not the only problem area on the board, for example the nose is delaminated, the rails are split at certain spots.In general, where do you usually use 4 oz and where the heavier fibreglass? many thanks, willem

[/quote]

I generally use 4 oz. (or even sometimes 2 oz.) when re-glassing over existing glass job, heavier fiberglass when glassing over only foam, or if existing fiberglass has no strength left.