Well the story goes as I recently stripped an old board down, rather hastily, doing some damage to some of the old foam. The blank now has some scars and valleys etc.
What i’m wondering is how to fix up this damage, to get a nice smooth surface again to perhaps glass the board again? I don’t really want to shave any more foam off so sanding / planing the whole thing down a cm or two is out, but maybe spackle? Or i think its called spak filla in aus.
What type of spackle / spak filla do i need, and is there any special way to apply it ? Does it make a bond with the foam good enough to glass over afterwards?
The blank looks pretty crusty to me…seems as if you would need to take it down a bit. Spackle is just a light weight filler…I use it to seal eps so it does not soak up resin too fast as you laminate. It also gives the board a more even cosmetic finish. No real structural bonding going on…pretty wimpy stuff…I would go with a cabosil mix if ya wanted the bond to be stronger. It will bond to the foam better and provide a better grip for the resin/glass. That said I would think the brown/gold crust has to go for the blank to be used. Have fun…
I’ve used cabosil and glass beads… I think that the glass beads are lighter and easier to sand.
Also… you might try some of that spray foam insulation from HD or any hardware store. Spray a little on and then cover it with syran wrap and put a piece of plywood over whit a brick on top. That should compress the foam and keep it contained in the area you want to fill. Check first to see that the spray foam will work with which ever resin you’ll be using. Good luck!
Have a look at what I did with my rebuild under 3’ 11" of pure fun, very similar to what you are trying to do. I agree, you have to get that brown crust off before you anything else. You might be surprised by what you find under all that.
Yeah i’ll see what i can do about shaving it off… there is some good foam underneath, and also some of the top foam is wierdly soft mushy but still dry…
Gives me something to mess around with anyways.
Exams so far have been like getting kicked in the nuts by a donkey. Probably have to repeat some units but its not the end of the world…hopefully.
I have my last one this friday YEOOOOOOOOOOOOOOOOOOWWWWWWWWWWWWWWWWWww
its going to be even worse though, its the worst unit.
If you use spackle, use DAP brand. Also, be careful with yellowing. The spackle will not yellow and the urethane foam will over time so you will end up with white patches showing through, depending on how you glass.
Spray foam… ya, it’s the stuff that expands that’s why I say cover it with syran wrap, ply then a weight. It’s that clear thin film that you wrap up your leftover food with. I’ve also seen it used in shipping to wrap a bunch of boxes with so they don’t move around in shipping. The resin doesn’t stick to it and it gives a nice smooth finish. I use it on top of a ding patch so I don’t have much after work to do. Yes, the foam is sandable.
