Pressure Casting Resin

step by step recap - walk through
The resin is mixed mixed and is ready to pour.

The resin is poured in the mold and ready to go into the PP.

The mold and the resin have been placed into the PP and I am slowly letting in air pressure to about 40 psi.

Now we wait.

After about 10 minutes it should be safe to remove the mold and de-mold the casting. A good way to tell is to check what resin was left in the pouring cup. If it is cured, then it should be good to go.

Pull your newly cast part out and admire the nice crisp casting. If things went well there should be no voids and everything should be crisp. If there are still some voids, try adding a little more pressure. I would suggest adding it in 5- lb increments. Once again, err on the side of subtlety.

The small pimple-like protrusions are from air pockets in the mold. The pressure has forced the resin into these as well. An easy clean up. To avoid these I will need to de-gas or remove the air in the chamber during the mold making process. (That is a whole new article in and of itself, will follow on this one). For the time being this will work fine.

The finished product. Maybe not as picture perfect as the big guys on the street, but sure as hell a lot of fun to do and it is good enough for what I have in store for it! Now that everybody is up to speed (Hopefully) get out there and make those models shine with all of those resin goodies you have been eagerly awaiting to cast!!
Final notes

First off, DO NOT CAST AND SELL OTHER PEOPLES PRODUCTS. This is illegal and will result in major heartache and financial problems.

Casting resins and plastics come in various types, colors, and most important, curing times. If you attempt to use Alumilite to pressure cast, you had better be lightning fast in your actions. Three minutes is not enough time to get through all the steps before it will “fire-off” or start to cure. The resin I use is a true resin, not a casting plastic, and it takes between 5-7 minutes for it to start its curing. You can tell when it is beginning to cure as it gets warm, sometimes hot to the touch. Micro- marc has a good selection of casting resins to choose from and I suggest checking there for resins and mold making items. I would also suggest Syn-air for your casting and mold making supplies. I just got a new list of materials that they offer, and it is jam packed with stuff. I know this was a quick, down and dirty how-to, but I hope everybody understands what they would need to do in order to make it happen. If not….well, I guess I can try to clear things up. Hope you all enjoy the article. “Q”
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About the Author

About Matthew Quiroz (Red4)

After a several year break from the hobby I have happily returned to it. Slowly, but surely getting my mojo back.