Can you mold spackle?

[FakeBritishAccent]

I'm currently scratchbuilding a comic based gun out of wood and foamcore. I'd originally planned on using Bondo to fill and smooth gaps but found its consistency hard to work with. Instead, I'm using drywall spackle. My question is will I be able to make a silicon mold of the gun after priming and sealing despite the porous nature of cured spackle? I wanna quit while I'm ahead if the spackle-filled gaps of my gun are just gonna stick to the silicone during the mold-making process.

 

[CustomCreations]

I have found silicone doesnt stick to anything other that itself, or curing polyurethene resins/rubbers.
I havent ever seen 'spackle' but doubt you would struggle with it.
I would, however, recommend using 'milliput' if you are struggling with conventional fillers, as its water based, you can work it to fit shapes and holes etc very easily, and required little sanding as a result !
D

 

[PHArchivist]

Not sure about the molding properties of the silicon-to-spackle connection. But I have used spackle as a filler because of how wel it smooths on, how cheap it is, and how easy it is to sand.

BUT...

We al know how soft drywall mud is even when fuly hardened. So I disovered Elmer's Woo Filler. Has ALL the same advantages of spackle, but dries harder - hardness similar to soft pine.

I used this on the Totokia offered by Wampa last year, and it was molded with slicon.

 

[blufive]

I have found silicone doesnt stick to anything other that itself, or curing polyurethene resins/rubbers.
D

Silicone can also stick to Pyrex. I made the mistake of using that as a mixing container once since I didn't have anything else handy.

:confused

 

[KitSmasher]

Silicone can also stick to Pyrex. I made the mistake of using that as a mixing container once since I didn't have anything else handy.

:confused

Been there, done that. It won't even scrape off with a razor blade!

 

[FakeBritishAccent]

Not sure about the molding properties of the silicon-to-spackle connection. But I have used spackle as a filler because of how wel it smooths on, how cheap it is, and how easy it is to sand.

BUT...

We al know how soft drywall mud is even when fuly hardened. So I disovered Elmer's Woo Filler. Has ALL the same advantages of spackle, but dries harder - hardness similar to soft pine.

I used this on the Totokia offered by Wampa last year, and it was molded with slicon.

Hahahaha...actually, wood filler was my first choice for a filling material. Ironically, I shot that idea down because I thought that it wouldn't be hard enough. Guess it's time to head back to Walmart!

Thanks for the info, guys!