bryanmc Posted June 15, 2017 Report Share Posted June 15, 2017 Does anyone have a decent source for tin sil 70-60 or some other high temp rtv to make a lead mold out of? I looked at a couple places but they want $35 to ship 1lb of rtv. Quote Link to comment Share on other sites More sharing options...
Jig Man Posted June 15, 2017 Report Share Posted June 15, 2017 I don't know much about that stuff but I got some at Auto Zone to use in one of my jig molds for some modification. It was very reasonably priced. You might check it out and see if it will work. 1 Quote Link to comment Share on other sites More sharing options...
bryanmc Posted June 15, 2017 Author Report Share Posted June 15, 2017 (edited) I'm not looking for a cheaper product Bob, I'm talking about not paying $25 for 1lb of silicone and then $35 to ship it. The mold I'm looking to make will be single cavity (approx 1.5" x .5" x .5" and probably see 10 castings at the most. Edited June 15, 2017 by bryanmc 1 Quote Link to comment Share on other sites More sharing options...
Anglinarcher Posted June 15, 2017 Report Share Posted June 15, 2017 For the amount and number of cycles you are doing, a silicon mold putty will work. Go to hobby lobby and get some Alumilite mold putty and be done with it. I have poured larger and more then you are doing with them and it came out very well. 1 Quote Link to comment Share on other sites More sharing options...
psilvers Posted June 15, 2017 Report Share Posted June 15, 2017 2 hours ago, Anglinarcher said: For the amount and number of cycles you are doing, a silicon mold putty will work. Go to hobby lobby and get some Alumilite mold putty and be done with it. I have poured larger and more then you are doing with them and it came out very well. That is some great info - will Alumalite hold up to 10 castings or so? I am looking to make some models from which CNC molds can be made. Pete Quote Link to comment Share on other sites More sharing options...
bryanmc Posted June 15, 2017 Author Report Share Posted June 15, 2017 5 hours ago, Anglinarcher said: For the amount and number of cycles you are doing, a silicon mold putty will work. Go to hobby lobby and get some Alumilite mold putty and be done with it. I have poured larger and more then you are doing with them and it came out very well. Can you make a 2 piece mold with it? Quote Link to comment Share on other sites More sharing options...
Anglinarcher Posted June 15, 2017 Report Share Posted June 15, 2017 Sorry it took so long to get back. Yes, it will take 10 castings or so. You should be able to get a couple of dozen or more if you let it cool a little between pours. Yes, you can do a 2 piece mold. Press the item into one side first, let it cure. Then do the second side. For the 2 piece I did, I used a small box to hold it and quickly mixed the putty, forced it into the box, then pressed the lead spoon mold into it about half way. I then quickly used a knife to flatten the mating surface/top like you would level butter in a cup when mixing it for baking. 15 minutes or so later I pulled the silicone out of the box and coated the mating surface with petroleum jelly. I then mixed more putty, forced it into the box, pressed the box over the part to form the 2nd half. Once cured, I separated the 2 pieces and used a craft razor knife to cut pouring channels and air escape paths. I actually saw Larry Dahlberg do this on his TV show "Hunt for Big Fish" some years ago, so I only wish I could take credit. LOL It was his idea. I should have that mold still, but it is lost in a move. It is in my back log of projects to perfect so if I get to it soon I will do a short video and post it somewhere. Hope this helps. When I get my project perfected, I have access to other molding materials that handle the heat just fine but do not require machining, but that is another subject and another day. 1 Quote Link to comment Share on other sites More sharing options...
bladesandbaits Posted June 22, 2017 Report Share Posted June 22, 2017 Why not try Bondo? I make all of my prototypes from Bondo which eventually wind up as a master then sent to Cast Industries for mastering baits for a vulcanized mold. I average getting several thousand spin cast baits from one mold. And Cast can spin me up a couple thousand pretty quick. Regards, Blades 1 Quote Link to comment Share on other sites More sharing options...
jcool3 Posted June 27, 2017 Report Share Posted June 27, 2017 On 6/14/2017 at 5:49 PM, bryanmc said: Does anyone have a decent source for tin sil 70-60 or some other high temp rtv to make a lead mold out of? I looked at a couple places but they want $35 to ship 1lb of rtv. Alumilite's Plat 55 buy direct from alumilite https://www.alumilite.com/store/p/927-Plat-55.aspx $27.50 for 1 lb plus less than $7.50 for shipping. Platinum cure should work fine for pouring lead. Quote Link to comment Share on other sites More sharing options...
