Would like to glue sawdust that I dyed brown onto a 4x8 sheet of foam board?
Question:I peeled the silver wrapping off. I was told to use a 50-50 mix of water and white glue and 2 drops of dish detergent. I am making ground cover for my Ho Scale train set. ths sawdust is has been dried out. This is the product that I'm using. Super TUFF-R polyisocyanurate insulation
Answers:
I have never tried anything quite like this before, but I would not think polyiso would be a good choice for this. It does not withstand moisture or UV rays well at all. Also, it is not very cohesive without the backer. The white glue should not cause a problem, but the water in it might. Given this and other wear factors, I would not expect it to hold up very long.
Polystyrene would be a better choice. Not the white "bead board" that crumbles into little white balls when you rub it, but the dense foam. Dow Styrofoam wall sheathing is one brand (blue), there are others (different colors -- pink, gray, green). Usually has a clear plastic film on it that you would need to take off. Make sure not to get the scored type, it will break at the score marks with minimal handling. The white glue should work well with this product, as would a spray type craft adhesive.
Try spray glue.
No problem. Paint a thin layer of the glue mix onto the board, wash and dry your hands really well (don't take too long), and then sprinkle on the sawdust. Tilt the board to make the excess fall off. If the excess sawdust comes off clean (no glue clumps) you can use it again the same way.
I would do a few small test pieces to get the sprinkle right.
Also, don't use a hot wire to cut that kind of foam board - it will make toxic gas.
Get a can of spray glue(the kind used for putting down counter top`s)at you`re local hardware or auto part`s store.Spray evenly on the poly(won`t hurt it)and sprinkle on sawdust.
Take a paintbrush and dip lightly into Elmer's glue spread it on the foam board and sprinkle the dust on.(Don't let anything else touch the board for a while)Then wash the brush, if you put a light enough layer of glue on you shouldn't see any clumps since the glue usually dries clear.
You could use some old gloss paint. It will act like an adhesive, easier to apply and cheaper. I have done similar.
White glue should not harm the insulation, but it may not stick very well either. If the surface is smooth might want to rough it up a little with sand paper. I think I would use spray adhesive, the kind for art work. It would be flexible and easy to apply, may dissolve the insulation too though.
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