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Mold Making and Resin Casting

Some have asked me about mold release. I personally do not use it for a couple of reasons. First, it is not necessary. Your parts should come cleanly out of the molds on their own without the aid of a release. Secondly, some resins and mold releases can react to each other and ruin your castings. You should be able to get 75 - 100 casts out of a single mold. After awhile, the oils in the silicone will breakdown and your castings will start to stick a bit. There is a solution to this that will net you many more castings and revitalize your molds. When your parts start to stick (usually after 20 or so castings) place your mold in a 250 degree F oven for a couple of hours. This redistributes the oils thus reconditioning the molds.
A note about re-casting:
Whenever you make a mold, unless it is your own work such as a sculpt or scratch-built part, you have to take into consideration the ethics of what you are about to do. Remember, if it is not your work, it is somebody else's, and copying that work, however innocent it may be, is still probably a copyright violation to the licensee of some sort. While I doubt that any of the companies involved would get too upset about you making a few copies for yourself, distributing those copies is another story and this practice can lead to big problems for you and whoever is involved.

Another even more frowned upon by your peers example of re-casting would be to copy a forum members hard work without their express permission. Even if it is just making copies for yourself, it is an unethical practice that has garnered many a violator banned from certain other forums. While I don't think we would have that problem here on Armorama, it is still an important point to make and one not to be taken lightly. So use discretion whenever you copy a piece that did not originate from you. Show the artist the respect they deserve and harmony will abound!

That about covers it. I hope this article has helped you in gaining a basic understanding of molding and casting. If you have any questions about anything to do with this subject, please feel free to contact me on the forum. I am there quite often!! Happy modeling.

About the Author

About Steve Sherman (bowjunkie35)

Steve is a freelance propmaker (the movie kind) and machinist. A former construction worker, he has been working with tools since childhood. He learned the construction/ metal fabrication business from his Father, so to follow in Dads footsteps was natural. Since leaving the construction industry, h...


Good informative article, very interesting. I've often considered making my own castings but have been deterred by the cost and lack of advice- at least one of those hurdles has now been addressed!
JAN 03, 2005 - 07:24 AM
Informative article, thanks, now maybe I can get rid of those lousy rubber/vinyl tires...... :-) :-) :-) :-)
JAN 03, 2005 - 08:23 AM
Yep, that is what I do also. It's in the article! Thanks Again guys for the compliments. LogansDad, I also use the 10:1 ratio RTV as it is more economical but much harder to use especially for someone just starting out. I used the 1:1 ratio RTV for the artivle for simplicities sake.
JAN 03, 2005 - 08:24 AM
Great article, Steve. I recently made my first attempts at molds and casting, and it seems like fun. Your info will help a lot. Thanks for all your hard work!
JAN 03, 2005 - 01:21 PM
I was trying to use the micro - mark info but it wasn't as awsome as yours. Now I might be able to do some stuff without ruining it., or waste money to just buy one part from a figure set. Thanks for the info. Happy Modeling
JAN 03, 2005 - 04:34 PM
Well thanks a million for sharing all these nice info with us . U really capture the whole procedure in a very good way amd very simpe to follow. Now i just have to come over there and get all the materials , rubber silicone and resin ...... Super nice article Costas
JAN 03, 2005 - 08:04 PM
hi Steve, thanks so much for the great article and very good photos. I felt reading a chapter of a modelling book more than a feature.it was very very helpful. congrats
JAN 03, 2005 - 11:40 PM
Just in time. I'm actually casting a couple of alice packs and German ww2 bergens.
JAN 05, 2005 - 01:25 AM
Wow!! You all are far too kind! It was really my pleasure, but the positive feedback is great. I am getting misty eyed! *tear* :-) :-) Again, Thanks for the comments, they do not go un-noticed!
JAN 05, 2005 - 03:43 AM
it's been said,but still...great info, very well presented, nice tone, am excoted about casting! Thank You!
APR 03, 2008 - 11:28 PM