No sanding prep on a PU Fiberglass repair

[Naeco78]

I recently bought a vintage Surfboard that looks like the nose was repaired without the sanding prep because the edges of the repair keep de-laminating somewhat if I try to sand/smooth them out.

Will the repair eventually fail completely if there was no sanding prep before the fiberglass repair was laid on top? It looks like its still water tight but wanted to know if anyone has experience if the repair will last long term like this? I think it was recently repaired by the person i bought it from.

It's a nice retro board so I'm wondering if I should maybe have it professionally repaired so I don't kill a collector board if the repair is bound to fail.

Adding a few pics of the repair...

[Naeco78]

[oldmansurfer]

Looks like an old board. Maybe it will keep delaminating. The reason why? There is a variety of possible reasons why. No sanding may be one reason not cleaning off the area after sanding or getting some other substance in that area after sanding or using a different type of resin all could be reasons for the delamination. Looks like it needs some resin to cover the exposed fiberglass

[Naeco78]

Thanks for the reply. Youre right i guess it could be lots of things or substances that could cause delamination if the area wasn't prepared correctly. The fiberglass thats showing in pics is actually inside/covered with the resin repair but for some reason it doesn't look saturated or clear like the regular fiberglass in a board. Probably not a good sign even though it's covered by resin on the outside surface.

Might need to get some quotes to have it professionally repaired. I've seen a couple similar boards in Surf Museum and Surfers Journal articles and I wouldnt wanna be the one to get it water logged or damaged after all these years. Sucks that it wasnt repaired properly the first time.

Looks like this was from late 60's/early 70's SoCal shapers that were involved in the transition to the Fish / shortboard revolution from what I've found so far. Interesting to learn the history of the older boards and there influence on modern designs.

I really like your signature quote. "Happiness comes in waves" so true!