Ultimate Predators Posted February 3, 2015 Report Share Posted February 3, 2015 Question: I started to inject plastisol from bait Junkys into molds Im heating it in a microwave, I noticed that when I inject swimbaits the heads are hollow and not all the way filled with plastic does anyone know why this is happening ? Im also having issues where i heat the plastic and any aluminum or stirring spoon that is not preheated and comes in contact with the plastic seems to cure it right away/ Any tips on keeping plastic from cooling off quickly ? Quote Link to comment Share on other sites More sharing options...
Jig Man Posted February 3, 2015 Report Share Posted February 3, 2015 Try slowing down your injecting. Stir with an ice cream stick instead of a spoon. Quote Link to comment Share on other sites More sharing options...
Yo Al Posted February 3, 2015 Report Share Posted February 3, 2015 For the hollow heads and other voids in baits I'd watch a YouTube video by caney creek molds called air in my baits. Says more than I can type here. For holding heat, preheating the stirrer helps as you already found. Also placing the pyrex on a hotplate will hold heat while injecting but is usually only necessary if using a large amount of plastic or trying to repeatedly shoot one or two molds. Quote Link to comment Share on other sites More sharing options...
Apdriver Posted February 3, 2015 Report Share Posted February 3, 2015 Sounds like you need to top that mold off with hot plastic. See, as the plastic in the body of that swim bait cools, it contracts and draws plastic from the runner. If it runs out of plastic it will draw air. So as it draws, pour more plastic in the sprue. See if that helps. 1 Quote Link to comment Share on other sites More sharing options...
Ccfish Posted February 3, 2015 Report Share Posted February 3, 2015 Ive found a 5/32 stainless heliarc welding rod works really good to stir the plastic Quote Link to comment Share on other sites More sharing options...
MonteSS Posted February 4, 2015 Report Share Posted February 4, 2015 Apdriver mailed it. You need to inject and then pour from your cup into the sprue to keep it topped off. Large baits or multi cavitiy molds may take two or three toppinfg offs. You can also make a sprue extender to stop this Quote Link to comment Share on other sites More sharing options...
Bassinfool Posted February 4, 2015 Report Share Posted February 4, 2015 A little off topic but a good trick nonetheless, a good way to prevent scorching in your cup, especially if you're reheating a lot is to take a piece of cardboard and cut it to the size of the glass in your micro. Place that piece of cardboard on top of the glass and you're good to go. Not sure why but it gives you much more even heating of the plastic and really decreases your chances of scorching your plastic. Quote Link to comment Share on other sites More sharing options...
archery1 Posted February 10, 2015 Report Share Posted February 10, 2015 like said earlier.. top off mold . i use the clear glass pyrex stir/swizzle sticks to stir all my plastic. i found them on ebay Quote Link to comment Share on other sites More sharing options...
