Ohhhkay, first, stop playing with it, no matter how addictive it is. There’s a story behind that, but not right away
So- pluses and minuses to all of these
Do nothing and keep an eye on it
Cut the glass out, fill the depression, and reglass.
Drill two holes and inject resin as glue
Drill two holes and inject actual glue (gorilla glue?)
The first option really isn’t a bad one, depends on how long you intend to keep the board. Keep it out of the sun.
But then there’s the second choice, which I’d avoid. There isn’t necessarily any depression in the foam, after all. If you very carefully cut the area out, ideally using a very sharp utility knife held so it’s an angled cut. Fill in carefully, using your choice of resin, resin plus thickener ( Cabosil, Aerosil, sugar, a lot of different things work and I have indeed used a lot of them) maybe by ‘buttering’ the back side of the original glass with your filler goo, stick in the original glass and clamp ( a band clamp or hold down strap applied gently, wax paper as a non-stick barrier) or lightly weight on top to get it flush, sand gently to perfectly flush or slightly concave, glass over the repair with a little light-ish cloth squeegeed ( 3/4 inch or so overlap onto the original glass), feather sand the edges of the new glass, hotcoat to fill the weave, sand, gloss, polish.
You see why I’d avoid it. It’s a lot of work, a lot of time. Done right it’d be strong, durable and nearly invisible. But if I was charging for the job I’d have to charge somewhere north of $100. Maybe well north. You get to the question of ‘is this worth it?’. You might want to, as an exercise in just how well you can do it. Me, I already know how-
Then we’ve got the injection methods. I’d lean towards using the ‘clear’ Gorilla glue, resin tends to make this translucent area and it’s a lot harder than the original, the jury is still out on whether or not that tends to make more delam around the edges. I wouldn’t just inject it, I’d infuse it, on the one hole you have your injector and on the other you rig a small shop vac or similar, to get all your filler resin or glue in (it’s called ‘infusing’), stop it a couple of times to massage the stuff to the edges of the delam. Again, and especially with the glue I would use a band clamp, wax paper and maybe even a piece of sheet metal to keep things from expanding and making things worse. And again, I’d put some light glass over it and so forth, as above. .
Good, strong, pretty easy and fairly unobtrusive fix.
And now the story. You were warned.
Back when, well, the first twin fins came out. Around the same time were the hollow boards, most were molded with a honeycomb material to stiffen, very much like aircraft construction, but there were some others-
Hansen made some, foam skins top and bottom, with foam pylons in the main cavity, outside glass conventionally. I have no idea what the details were beyond that, whether or not they glassed it inside, I doubt it. For equalizing purposes ( to kep it from imploding in cold water) it had this little hole towards the nose which was closed with what looked like the little plastic plug out of a squirt gun.
No idea what they cost, or if they made money on it, the setup must have been expensive. And I didn’t have one, somebody in our circle did, kid we called Lunga Louie for a long forgotten reason. We didn’t like him much. His parents bought him the thing.,And one flat day, we discovered you could do things with it.
If you took the plug out, you could push the deck and it would ‘exhale’. Okay. You could put your mouth over the plug hole and really suck out quite a lot of air. Heh-
We didn’t like Lunga very much, as I said. We sucked out quite a lot of air and put a lit cigarrette to the hole and it would take one long inhale, burn up the cigarette like what would happen sharing a smoke in the boy’s room in junior high. That was kinda fun, we thought we might give Lunga’s board cancer.
But the best was when we discovered that if you thumped the deck, the board would do a really nice smoke ring. You now maybe see why I said don’t play with the delam, we probably thumped that board half to death, blowing smoke rings .
hope that’s of use
doc…