Tree_Fish Posted July 21, 2011 Report Share Posted July 21, 2011 Hey guys I'm pretty new to pouring but with all the info on this site I am well on my way to becoming an addict at making my own baits : o Ok so my question is I have seen a lot of guys saying they only use PoP molds to pour their plastics and I'm assuming that some of them have to be injecting. I bought a 4 oz marinade injector, cut the needle off and drilled the tip out a little to make the hole bigger. Now it is my understanding for injection you need a sturdy airtight fit in your mold for the injector to work properly. Can anyone give me some advice as to how to accomplish this with a pop mold? I have tried taking the tip off and making it a part of the mold, but when I insert the tip into the PoP I can feel a little wiggle and I get worried if I put to much pressure on it it's going to spit plastic at me. Will the plastic on the tip (from when I fill the injector) help insulate this connection? I havent actually tried injecting with it yet, wanted to get a little clarification and try to avoid mistakes ahead of time if at all possible. Quote Link to comment Share on other sites More sharing options...
GB GONE Posted July 21, 2011 Report Share Posted July 21, 2011 I inject some pop molds and an airtight seal is not required. You are correct in assuming that if you apply to much pressure, you are going to at least get plastic everywhere and may actually crack your mold or at least get plastic on the uncoated surface between the mold halves (PITA!!!!). Do not look for a perfect seal at the sprue area or at where the halves meet. With aluminum, you can apply great pressure in holding the mold halves together with clamps or nuts/bolts. POP obviously is not going to take that kind of pressure. Go slow and easy and you molds will fill without issue. Check this POP injection bait.... Even with the smallest appendages and tiny hairs on the claws, the plastic makes it will the smallest amount of pressure on injector. Jim Quote Link to comment Share on other sites More sharing options...
Tree_Fish Posted July 21, 2011 Author Report Share Posted July 21, 2011 I inject some pop molds and an airtight seal is not required. You are correct in assuming that if you apply to much pressure, you are going to at least get plastic everywhere and may actually crack your mold or at least get plastic on the uncoated surface between the mold halves (PITA!!!!). Do not look for a perfect seal at the sprue area or at where the halves meet. With aluminum, you can apply great pressure in holding the mold halves together with clamps or nuts/bolts. POP obviously is not going to take that kind of pressure. Go slow and easy and you molds will fill without issue. Check this POP injection bait.... Even with the smallest appendages and tiny hairs on the claws, the plastic makes it will the smallest amount of pressure on injector. Jim Hey thanks for the advice Jim, thats a pretty good pour for PoP! I'm just waiting for some plastic to get here then I'll be pouring like a madman lol. I have been lurking your posts and images in the gallery, you've got some awesome skills man! Hope I can pour like you someday! Quote Link to comment Share on other sites More sharing options...
GB GONE Posted July 21, 2011 Report Share Posted July 21, 2011 Don't sell POP short. You can have production baits out of POP molds for sure. You will be teaching me new tricks soon I am sure!!!!!!! Jim Quote Link to comment Share on other sites More sharing options...
rixon529 Posted July 21, 2011 Report Share Posted July 21, 2011 I inject some pop molds and an airtight seal is not required. You are correct in assuming that if you apply to much pressure, you are going to at least get plastic everywhere and may actually crack your mold or at least get plastic on the uncoated surface between the mold halves (PITA!!!!). Do not look for a perfect seal at the sprue area or at where the halves meet. With aluminum, you can apply great pressure in holding the mold halves together with clamps or nuts/bolts. POP obviously is not going to take that kind of pressure. Go slow and easy and you molds will fill without issue. Check this POP injection bait.... Even with the smallest appendages and tiny hairs on the claws, the plastic makes it will the smallest amount of pressure on injector. Jim Jim - Didn't you mention at one time using RTV to create a gasket / o-ring type seal at the injection point to help protect the PoP from chipping? Rick Quote Link to comment Share on other sites More sharing options...
GB GONE Posted July 21, 2011 Report Share Posted July 21, 2011 You are correct Rick. In the end, I found that the gasket was to air tight and caused me to push to much plastic in, splitting the mold in half with plastisol. Without it, I can see when the mold fills and stop pushing. Jim Quote Link to comment Share on other sites More sharing options...
GB GONE Posted July 22, 2011 Report Share Posted July 22, 2011 (edited) PS Vodkaman (Dave) came up with idea for using RTV as an adapter. That thread was a good read if you go back and find it. Jim Edited July 22, 2011 by ghostbaits Quote Link to comment Share on other sites More sharing options...
