This is why you use PVA to coat your mold.

This PVA barrier (4 coats of PVA sprayed on) keeps the epoxy from sticking to the mold.

Category:

Science & Technology

Tags:

• fiberglass
• vacuum
• bag
• PeelPly
• PVA

[iceboxx187]

for the record, for a at home do it yourselfer, you dont need pva for small projects, I ran across an article about some west marine guys using hairspray one day because they were out of pva and they said it worked, so i tried it, and i can vouch... you need like 10-14 coats of it though, and it washes away with water. i used a hairdrier to cut down time between coats

[lesburn1]

@iceboxx187 Do the math, $15 for a gallon of PVA vs $5 for 16 oz of hair spray.

[datzfast]

so is it like a saran wrap?

[lesburn1]

No it is a liquid that is sprayed on and when it is dry it forms a film.

[lesburn1]

@datzfast It create a barrier between the mold and the glass (or carbon, whatever)

[iceboxx187]

i'm not saying pva isn't good stuff, it is, but it just isn't necessary for diy projects. I've never seen partall (my preference) for less than 20 a gallon, and i've never paid $5 for a can of hairspray, you can get hairspray for $1 a can at the dollar store, and if you do the math, that adds up to $8 a gallon plus tax. even if your' local dollar store only stocks 8 oz cans, it's still 16 plus tax, and it's readily available, whereas pva can cost 15 just to ship if you dont have a local supplier

[datzfast]

@datzfast so is dry sprayed on film like saran wrap

[PLASTERM66]

PVA, polivinilic alcohol is a liquid that becomes a film allowing the release of the part. Usually it use wax and PVA together.

[MrMadmickey]

will this work with a plaster base????