Thread: Another Go At It

Got these ready to make a POP mold of. I am looking to do a two piece injection mold again. Will be pouring first half in the morning.
Everything goes right with this one, I will make a second one. Been playing with the idea of making a silicone copy of an aluminum mold and making a plaster mold from the silicone copy. Anyone ever do that. Would love to hear how it came out, method used, etc. Thanks for the look. Eric, AKA Jamesdean


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I will post picks as I get each step done...This is a full size glue stick 3.94” long by 0.41” in dia. . I took a plastic coated paper clip and straightened it out, then cut plastic off. Cut it into lengths of approximately 1/3” to3/4”, heat it while holding with pliers and pushing into the glue stick. In seconds it glued in. Alternating sides so the stems are offset, and enough room between so the lures don’t touch. Sometimes adjustments must be made. If the pin has to be moved, heat the end with a lighter and pull it out reheat and push in new spot.
To attach soft plastic it’s just a mater of pushing it onto the pin so it touches the glue stick solidly.
Mix up your Pop thoroughly and pour onto your mold. I lightly bounce the mold a few times to move any air bubbles from mixing to the top, then carefully place the masters including the glue stick into the plaster trying to keep the baits as straight as possible, yet only about 1/2 way submerged into the POP.
There will always be some clean-up to do after this part dries. Then it’s just a matter of letting the plaster dry. I have a set of four picks I picked up at Harbor Freight for a few dollars, that I use to remove any excess plaster after a couple hours of drying, before it sets up hard. Lightly brush out the debris and let it finish drying, usually the remainder of 24 hrs from the time I finished mixing the POP.

Once it’s dried and any more residual cleaning is done, I either spray the mold top with Pam cooking spray, or lacking that paint it and the lure tops with a light coating of Vaseline. Pam is bu far the faster method. Now mix the same amount of POP as you did for the bottom half of the mold. Once mixed, I spoon it over the lures till they are well covered and no air pockets touching the lure. Then pour remaining mix over the bottom half of mold. Tap it a couple times on bench/table top to remove any air bubbles that might make a weak spot in the mold. Then it’s just waiting for it to dry. More to come tomorrow...


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Originally Posted by Jamesdean

I will post picks as I get each step done...This is a full size glue stick 3.94” long by 0.41” in dia. . I took a plastic coated paper clip and straightened it out, then cut plastic off. Cut it into lengths of approximately 1/3” to3/4”, heat it while holding with pliers and pushing into the glue stick. In seconds it glued in. Alternating sides so the stems are offset, and enough room between so the lures don’t touch. Sometimes adjustments must be made. If the pin has to be moved, heat the end with a lighter and pull it out reheat and push in new spot.
To attach soft plastic it’s just a mater of pushing it onto the pin so it touches the glue stick solidly.
Mix up your Pop thoroughly and pour onto your mold. I lightly bounce the mold a few times to move any air bubbles from mixing to the top, then carefully place the masters including the glue stick into the plaster trying to keep the baits as straight as possible, yet only about 1/2 way submerged into the POP.
There will always be some clean-up to do after this part dries. Then it’s just a matter of letting the plaster dry. I have a set of four picks I picked up at Harbor Freight for a few dollars, that I use to remove any excess plaster after a couple hours of drying, before it sets up hard. Lightly brush out the debris and let it finish drying, usually the remainder of 24 hrs from the time I finished mixing the POP.

Once it’s dried and any more residual cleaning is done, I either spray the mold top with Pam cooking spray, or lacking that paint it and the lure tops with a light coating of Vaseline. Pam is bu far the faster method. Now mix the same amount of POP as you did for the bottom half of the mold. Once mixed, I spoon it over the lures till they are well covered and no air pockets touching the lure. Then pour remaining mix over the bottom half of mold. Tap it a couple times on bench/table top to remove any air bubbles that might make a weak spot in the mold. Then it’s just waiting for it to dry. More to come tomorrow...


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PM SENT

Mike

As promised I got the molds first half poured this morning and will see if my phone will let me sign on so I can post the pics. in the thread, as it helps with the explanation of what’s going on...

Ok, not sure why but phone won’t connect to the soft plastic thread even though it’s logged into C.C. So I will go with out the pics for now.

Ok ok the plastic container I’m using for the mold is one from the lunch meat section of Walmart. The meat comes in little bags in the container. I measure out 2cups of dry POP then place in a mixing container, in my case a Pyrex glass bowl bought for this purpose, but anything that’s clean will work, but must be large enough to hold a quart or 4cups...
I then measure a single cup of water and add to the POP. Mix very well till there are no lumps, as inside the lumps are dry and will weaken the mold, the POP will have the consistency of a runny pancake mix. Now pour the mix into your mold. I tap the mold several time till I see no more air bubbles coming to the surface of the POP.
Now for the tricky part. Pick up your masters and spruce,I.e. glue stick, and place it on top of the POP. You want it to be in the plaster about half the thickness of the master. Place this on a level spot and the waiting begins for it to dry and harden. After a couple hours it should be hard enough to clean up the top surface and smooth out any irregularities there. Also remove any pop that may have gotten on top of the originals. Clean this up without removing from your mold container. If you can’t get it off the original without removal, or damaging the original, not to sweat, just leave it. When completely hard after letting it sit for 24 hours from pouring time it’s time to add your mold release to this half of the mold. I use a 1/4” to a 3/8” drill bit twisted by hand gently to make a couple alignment marks, that will be filled with POP when pouring the other 1/2. You don’t need to go real deep with these. Maybe 1/2 the depth of a normal size marble kids USED to play with...
Now you can use Pam cooking spray, Vaseline and a small craft paint brush, or a lot of other things to accomplish this part. If you were not able to get any POP off the original, some remaining their, make sure this area DOES NOT get your release agent as you want the new wet POP to stick to it, while not sticking to the rest of the mold...
once it’s coated well, repeat the measuring and mixing of POP as you did the first 1/2 of the mold. I measure the same amounts so the mold is equal on both halves.
Once well mixed, I use a spoon to cover the masters with to insure there are no air bubbles trapped in the plaster next to the originals...and then pour the remaining POP into the mold container. Tap the mold on the work bench a few time to release any trapped air bubbles. Place on a level surface to set-up and harden, usually about another 24hours.
I will post the fishing touches up later today. Thank you for tagging along. Eric, aka Jamesdean.

I would like to see you do a video in the process of making your molds I am enjoying reading your posts they’re very precise.

Originally Posted by snake River

I would like to see you do a video in the process of making your molds I am enjoying reading your posts they’re very precise.

Snake River, if I ever get where I can afford a camera, I probably will make a video, but don’t see it in the near future...


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Originally Posted by Jamesdean

Snake River, if I ever get where I can afford a camera, I probably will make a video, but don’t see it in the near future...


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But thank you for the compliment on how to do these. I know it is when someone makes a video, and either in editing, or in doing it, what ever it is, leaves things out. It is very frustrating to the one trying to learn something, as well as it can get costly...Thanks again.


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Yes very good thread and detail. Thanks Eric

Your doing great Eric