Slims Posted February 25, 2012 Report Share Posted February 25, 2012 I tried the search function, but rtv is too small of a search term. I want to try to pour an rtv mold. I only have two options locally, a 1lb batch or a 5 lb batch. I want to try the 30 dollar option before I spend 100. So, my question to you guys is: how many molds will 1 lb make? I know it depends on the box size, but lets say I want to have 3 trout worms in a mold. Also, should I make a rectangle, square, or circular box? Any info is appreciated. Thanks Quote Link to comment Share on other sites More sharing options...
wchilton Posted February 26, 2012 Report Share Posted February 26, 2012 RTV is a little more dense than water. I usually just figure it in water weight/volume and add 10%. It's easiest to figure in cm because 1 cubic cm of water is 1 gram. For the trout worms you'll want about 1/4 inch between baits and another 1/4 inch around the outside edge (minimum) so figure 3.5 inch length for 3 inch worm and 2 inch width to accomodate 4 or 5 worms. That's 7 cubic inches x 2.54 x 2.54 to convert to 45 sq cm. Figure 1 cm thick (makes it easy) and your mold will need 45 cc + another 10% so 50 grams of RTV. A pound is 454 grams so you'd get 9 molds of that size out of the pound of RTV. That's not a very large mold, and they can require a lot more very quickly. I've made a few single-cavity fluke-type molds (5-inch or so) and I'm usually starting with 150 grams of RTV for one those. Quote Link to comment Share on other sites More sharing options...
davefarley98 Posted February 27, 2012 Report Share Posted February 27, 2012 You just blew my mind. Quote Link to comment Share on other sites More sharing options...
Slims Posted February 27, 2012 Author Report Share Posted February 27, 2012 My mind was blown as well. I just went to a local hobby shop and bough the 1 lb bucket and followed the "every 2 little cups of silicone, asd 2 scoops of catalyst". What I did first was add dry rice to the mold box until it filled to the point I needed it to. Then, I used the measuring cups to scoop out the rice until it was gone. That many little cups of rice is how many little cups of the silicone I used. It turned out 4 little cups of the silicone is how much I needed and 2 scoops of catalyst. Now, how am I supposed to clean out the measuring cup and catalyst scoop? Just use dawn and hot water? Or should I use alcohol? right now the are just sitting in my garage, and I did a pretty good paper towel wipe to get most of the crap out. Quote Link to comment Share on other sites More sharing options...
