Hello,
Well I thought the two part polyurethane foam would melt in acetone...
Well the styrene foam is easier to get and cheaper...and I need to do the
parafin wax trick anyways to get a smooth interior surface. Willthe acetone
eat the wax or do I just run boiling water through it.
The reason why I want to do this 'lost foam' method is that the box
is probably going to be pretty convoluted and have all kinds of wacky angles...
I would liek to jsut cover it all at once with the S2 glass as opposed to
making it in sections and gluing it toghether.. I think that it will be much
stronger that way.
Daniel 69 2000
SF CA
> Hey all,
> the two part polyurethane foam will be fine, but try a little block with
> your resin before you do major shaping job. (my background says styrene foam
> (refrig packing) melts in solvent, urethane foam doesn't, but maybe your
> product is a different mixed beast) What does result is a rough inner
> surface, which for the smooth air flow is NOT what you want. One trick I
> have seen is to gently brush the outside with softened paraffin wax,
> available in the canning/preserve section in the the store. This gives a
> nice surface you can further smooth if you want, and easy release later.
> (also creates a barrier layer so that you can lay-up polyester resin on
> styrene foams) There are simple techniques for getting a split (2-pc) airbox
> off a single buck, but I won't bore the masses (probably too late) with the
> details. Contact me off list if you are interested.
> Fergus O
|