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I'm intending to attempt some resin casting soon, and I acquired some Amazing Mold Putty and Easy Cast Casting Epoxy to that effect.
I've found a few guides around, but I was wondering if anyone knew from experience how much of an undercut this type of molding material allowed.
I'm intending to start out with a very simple wheel mold, somewhat larger than Trukk wheels, and I would prefer to do it as a simple single piece mold.

Any advice would be welcome

I recommend, as a beginner, the Smooth-On Starter set, which is only $50 or $60. It teaches you all you should need to know about casting 1- and 2-part molds, from what I hear.

OK for beginer I would say go and visit Tap plastic web site..

They have a starter it, of silcone, and resin,
it will cost you about 45 to 50 dollars...
But you can produce about anything if you follow there steps... or contact me. ( i been casting for years and i use to do it for a living).


I can get a about 1000 casting from my molds before i have to do a little repair..

Next time i make a mold . i'll do a wal thur with pictures or a video.

I don't think that mold puttys will stand up to undercut casting for very long, not to mention how it would turn out when you cast it.. Even with silicone you have to be somewhat careful when dealing with undercuts.

If you do end up casting something with peaks or undercuts, just be sure you include some air vents to avoid recesses (bubbles) in the high or low areas.

Well I have this product already, and I'm going to attempt it with this stuff first. I'm not looking for much detail, but I guess I'll find out.
It's a wheel, there's no real high of low area that could trap bubbles, but I guess I'll see
Thanks

If you plan to do something like a trukk wheel and don't want to do a 2-piece mold, I'd suggest doing two halves to be glued together, like the plastic trukk kit. With a little glue and some light sanding/filing, you should be able to get a very detailed cast, if you so desired, with those simple supplies and little to no undercutting which might strain your mold putty.

who uses mold putty? Oomoo 25 1:1 silicone is what EVERY beginner caster should be using.

Once you have learned the art of 1:1 mixing and mold making, then move on to higher quality 10:1 silicone.