AlbyDogGone Posted March 17, 2004 Report Share Posted March 17, 2004 Just wondering if you guys push the Masters in the RTV at the top or do you glue the masters to the bottom like with resin? Thanks Alby Quote Link to comment Share on other sites More sharing options...
dtrs5kprs Posted March 18, 2004 Report Share Posted March 18, 2004 I put them on the botom, usually spray adhesive or pins, and pour the RTV over them. Have seen references to putting them in the top and holding down with glass, etc...seems risky. Quote Link to comment Share on other sites More sharing options...
rookiepourer Posted March 19, 2004 Report Share Posted March 19, 2004 I bought some silicone to make my own molds and the first one was a disaster. I tried to stick the blanks in after filling the cavity with the RTV. Turned out there was alot of air bubbles in the RTV. the second ones I did I glued the blanks on the bottom and the air bubbles are now on the bottom. I have seen other molds made from the top but they had a machine that sucked all the air out of the silicone first. Hope this helps. Mark Quote Link to comment Share on other sites More sharing options...
AlbyDogGone Posted March 19, 2004 Author Report Share Posted March 19, 2004 Mark So when you glued the masters on the bottom, are saying there were still air bubbles or that it worked better glueing them on the bottom? Alby Quote Link to comment Share on other sites More sharing options...
dtrs5kprs Posted March 20, 2004 Report Share Posted March 20, 2004 There will be lots of bubbles when you are done stirring, but they should rise to the top of the container. Have made LOTS of RTV molds, yet to have a bubble where it would negatively affect a cavity. One trick I use is this: after pouring in your RTV, set the curing mold on top of your kitchen counter, over the dishwasher, and turn it on. The vibration from the washer will help get rid of the bubbles. Really pretty slick. Quote Link to comment Share on other sites More sharing options...
Chris Posted March 20, 2004 Report Share Posted March 20, 2004 I am going to make some molds this weekend and was wondering if I need to coat the worms before I pour the RTV on them? How long do they take to cure? Thanks Chris Quote Link to comment Share on other sites More sharing options...
dtrs5kprs Posted March 21, 2004 Report Share Posted March 21, 2004 I do not coat the baits. A little of the factory oil is ok, too much likely a problem. Cure time is going to be dependent on the accuracy of your mix ratio and the type of RTV you are using. Temperature also plays a factor. I have some RTV that is mostly cured in 8 hours, some takes 24 plus. Average is probably about 12-16 hours. Quote Link to comment Share on other sites More sharing options...
rookiepourer Posted March 21, 2004 Report Share Posted March 21, 2004 Alby The molds I made by glueing the blanks on the bottom turned out alot better that way. After they were cured the air bubbles are not noticable on the top but if you turn the mold over you can see the bubbles that never made it out. I was using RTV I got on-line from an art suppy store called Douglas and Sturgess (San Fran). The cure time was alot faster by putting them in the oven. I was pouring worms three hours later. They have a data sheet thats provided with the silicone for ratio and cure time. Hope this helps Mark Quote Link to comment Share on other sites More sharing options...
AlbyDogGone Posted March 23, 2004 Author Report Share Posted March 23, 2004 Thanks for the advice Alby Quote Link to comment Share on other sites More sharing options...
