TK1 Posted December 10, 2007 Report Share Posted December 10, 2007 I am new at making molds and need a little help.. I tried making a two piece plaster of paris mold for 5 inch senkos. The first side of the mold came out great as well as the second side. When I went to seperate the two halfs...well I couldn't seperate them. Aluminum foil was used in the corners but I guess that did not work. Am I missing something here? Any tips on pouring the plaster so I can seperate the halves? Greatly aprreciated! Quote Link to comment Share on other sites More sharing options...
Norway pike Posted December 10, 2007 Report Share Posted December 10, 2007 Did you cover the first part with vaselin, before you pourd the second side? If not, do that:) Quote Link to comment Share on other sites More sharing options...
Boskabouter Posted December 10, 2007 Report Share Posted December 10, 2007 Just look a few pages (page 4 or 5) further. Delw submitted a very nice tut about making one piece and two piece molds. That should help you. While making a 2 piece mold you should use a release agent between the two parts. Just read Delw's tutorial and you'll get the picture. Quote Link to comment Share on other sites More sharing options...
Vodkaman Posted December 10, 2007 Report Share Posted December 10, 2007 You may not be using enough alu foil. Just in the corners is not enough. Quote Link to comment Share on other sites More sharing options...
TK1 Posted December 10, 2007 Author Report Share Posted December 10, 2007 Thanks for the input.. I greatly aprreciate it !! Quote Link to comment Share on other sites More sharing options...
stratmanv Posted December 11, 2007 Report Share Posted December 11, 2007 I experimented with the pic tutorial Vodkaman put up and make a copy of an aluminum mold using his overpour method. See what you guys think of my first POP 2 part mold. This is as simple as overpouring the whole mold opened up. I framed out a quarter inch around and used the plastic as my master and poured the POP into it. Quote Link to comment Share on other sites More sharing options...
longhorn Posted December 11, 2007 Report Share Posted December 11, 2007 Great looking mold ! Quote Link to comment Share on other sites More sharing options...
Spike-A-Pike Posted December 11, 2007 Report Share Posted December 11, 2007 Stratmanv, That turned out great. How come my science project turn out that well??? Bruce Quote Link to comment Share on other sites More sharing options...
stratmanv Posted December 11, 2007 Report Share Posted December 11, 2007 So far so good. Still have to see how it pours after I seal the thang. Quote Link to comment Share on other sites More sharing options...
Vodkaman Posted December 12, 2007 Report Share Posted December 12, 2007 Looks great! Don't rush the sealing process, if you can, give it over might. You don't want to spoil it now. Quote Link to comment Share on other sites More sharing options...
Senkosam Posted December 12, 2007 Report Share Posted December 12, 2007 When I posted the tip a few years ago about using aluminum, I should have included a photo. The reason I use aluminum foil is that it tells you exactly where the line of separation is so that when you poke a slim screw drive into the line, you don't destroy the mold. I lay it on the surface of the first side but only a 2" wide strip in the shape of an L. One side goes up the pan or container and the other lies smooth and flat on the plaster surface that was previously coated with a thin layer of vaseline. The corners don't have any foil but they may; it's basically for the long straight edges. Of course, the sides should be at least 5/8" thick to withstand prying the sides apart. Any thinner and disaster can happen. Quote Link to comment Share on other sites More sharing options...
Vodkaman Posted December 12, 2007 Report Share Posted December 12, 2007 Senkosam, my interpretation of the foil application, is to reduce the contact area of the plaster. As long as you do not get too close to the mould cavity, otherwise a 'flash' gap would be introduced. I now bake the first half and seal it. I pour the second half the next day. No foil, just petroleum jelly or pam spray. Quote Link to comment Share on other sites More sharing options...
Senkosam Posted December 12, 2007 Report Share Posted December 12, 2007 I'm in a hurry to use the mold ASAP and the plaster is barely hard when I separate the sides, after which I slap on some wall board sealer and start pouring. To me the foil is only a guiding line that I chip away excess plaster until I find areas around the mold to pry the parts apart. The vaseline keeps the facing surfaces from bonding. BTW, I liked your intro. Too bad we don't live a bit closer. Quote Link to comment Share on other sites More sharing options...
