Vacuumform helmet question

I have built my own vacuformer, and it can be done on the cheap. After all the work, effort and money, I recommend paying the $125 for the Proto-Form plans and pay a fabricator to weld up all the parts. I the thinking has been done for you.

Toragh said:

Isn't there a non-stick spray for vacuum form molds? I remember something baout some non-stick spray for molds, but I can't remember if it's for vacuum forming or resin casting.

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Alot of Thermoforming plants use a product similar to WD40 as a "mold release" just keep in mind that you want to try and stray away from any flammable sprays as you deal with heating elements typically around your formers.

MandoMan said:

It was probably for some kind of casting. To my knowledge, you don't need to spray or coat the mould with anything, since the plastic doesn't get hot enough to melt to the mold.

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Well, some materials and the way a mold is cut is a good reason to use a release. When I used to make clear acrylic lenses for Airplanes, they had to be blemish free, so we used polished gelcoated molds and for a mold release we used a clear cooking oil. So its all dependant.

Toragh said:

It won't stick to plaster, eh? Do you think I could use this stuff for molds? Or at least as a first step towards a mold then smoothing it out and such?

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I wouldn't recommend using plaster bandages...your best bet is going to be to make your piece via a clay sculpt or other medium, and then remolding it out of plaster or hydrocal. making a solid piece ensures strength in the mold and many casts to follow. It also provides rigidity as when you suck the plastic down on top of it, the pressure will not buckle the piece or mold if it were just plaster bandages.

clonesix said:

I have built my own vacuformer, and it can be done on the cheap. After all the work, effort and money, I recommend paying the $125 for the Proto-Form plans and pay a fabricator to weld up all the parts. I the thinking has been done for you.

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they are cheaper now... the plans are down to $75, which makes it an even better idea!