Aluminum Foil To Cover A Mold For Fiberglass..

[ptcary]

So I gotta make an underhood battery tray, so I made a mock up out of cardboard. What do I cover the cardboard with so resin and glass cloth don't stick to it? Aluminum Foil?

[jlgn_2000]

i usually do foil, and then duct tape and then spray it with a lubricant so its easier to remove

[Mesto]

i usually do foil, and then duct tape and then spray it with a lubricant so its easier to remove

Spray what with lubricant?

[The Performer]

Just cover everything you don't want the glass to stick to in foil. (The more shiny side up) Then you can use a release agent, (wax) on the foil as well.

Then just lay a wet batch of resin, be quick and stipple the mat into that resin, then start building up layers as usual.

Only thing I wouldn't recommend is using the spray glue to get the first layer. It's always easier when building enclosures to start off by gluing the mat to the surface then coming in with resin, however on a project where you will be releasing the glass from the object you don't want to go that route. Just brush an even layer of resin and add the glass to it right away, and use the brush to stipple the glass down into the resin, and it will soak into the glass making a very good first layer.

[raytard]

even without a release agent, the foil usually peels off pretty easily as long as you put it down real smooth and theres no ridges to grab on, or seams for it to seep through. but a little bit of foil never really hurt