Smooth Cast 300

[om617]

Hi.

Has anyone any experience with Smooth Cast 300? Looks pretty easy to use from they`re youtube video. 

My question would be what would be ideal to use for mold? Got my hands on some uptops and thought 

i give it a shot on cast some examples. If a success,i might try cast 61-64 GM full size station wagon roofs.

[crazyjim]

I've been using Smooth-On for a few years, Tommy.  Smooth Cast 300 along with their OoMoo 30 for the molds.  Both products mix a 50/50 ratio so it's easy to measure.

[om617]

I've been using Smooth-On for a few years, Tommy.  Smooth Cast 300 along with their OoMoo 30 for the molds.  Both products mix a 50/50 ratio so it's easy to measure.

Thanks Jim. Does it require some sort of mold release before you pour it? I`ll check out the description you mention for making molds.

[crazyjim]

I use baby powder as a release agent if needed.  Bear in mind that I do only 1 part molds.  You would need a better release agent if you're doing 2 part molds.

 

[om617]

Okay thanks. Looks like i will have to make 2 part molds for these items. 

Here is another product that looks interesting and easy to work with. 

[Kit Basher]

If your molds are made of RTV silicone rubber, you may not need mold release when casting. I've cast a bunch of small parts, and they come out of the mold easily without mold release. I've never done a body, mold release might be necessary for those. It's very important to use mold release when you pour the second part of a two part mold, as RTV sticks to itself really well. I've used both Smooth On and Alumilite mold release. Both work fine. Smooth-Cast 300 is easy to use and works well.

[aurfalien]

If your molds are made of RTV silicone rubber, you may not need mold release when casting. I've cast a bunch of small parts, and they come out of the mold easily without mold release. I've never done a body, mold release might be necessary for those. It's very important to use mold release when you pour the second part of a two part mold, as RTV sticks to itself really well. I've used both Smooth On and Alumilite mold release. Both work fine. Smooth-Cast 300 is easy to use and works well.

I've used Vaseline and will try baby oil in 2 part molds.  When it comes time to drop in resin, I remove surface tension by a slight sprinkle of baby/talc powder.

Seems like any petro based fromage would work to prevent RTV to RTV stickage no?

Edited January 6, 2016 by aurfalien