nastyboys Posted September 20, 2011 Report Share Posted September 20, 2011 Having a problem pouring 9inch swimbaits. I am using a 2 piece pop mold and the baits are caving in not sure maybe i need a larger pouring hole Quote Link to comment Share on other sites More sharing options...
Jig Man Posted September 20, 2011 Report Share Posted September 20, 2011 You may be pouring too fast and the mold is not getting completely as the plastisol gets close to the top. Quote Link to comment Share on other sites More sharing options...
nastyboys Posted September 20, 2011 Author Report Share Posted September 20, 2011 I tried pouring really slow did not solve the problem the baits are big i think as they start to set up they and suck the plastic out of the reservoir i tried to refill it but no help. maybe i have to make a new mold with a bigger reservoir. Quote Link to comment Share on other sites More sharing options...
Vodkaman Posted September 20, 2011 Report Share Posted September 20, 2011 Your proposed solution sounds like a good idea. The plastic does shrink and does need topping up. Dave Quote Link to comment Share on other sites More sharing options...
powerworm Posted September 20, 2011 Report Share Posted September 20, 2011 you are on the right track that is exactly what is causing your baits to "cave" or have dents is there isnt enough of a reservoir on hot plastic to draw into the cavity as the bait cools Quote Link to comment Share on other sites More sharing options...
mark poulson Posted September 20, 2011 Report Share Posted September 20, 2011 You can make a reservoir by wrapping the top of the mold with duct tape that extends up past the mold another 3/4". It will hold enough plastic to allow for the shrinkage from cooling. Quote Link to comment Share on other sites More sharing options...
nova Posted September 20, 2011 Report Share Posted September 20, 2011 (edited) Make sure that the hole going into the mold at the bottom of the sprue is large enough.(at least 1/4" dia.). The plastic is cooling too fast at that point and closing off the reservoir; then the plastic continues to shrink in the bait causing the dents. Just re-seal the new holes. You can still use the the same mold, just make sure that you pour slowly into the reservoir once it's full so that the hot plastic is flowing through the neck as it gets sucked down into the mold. This will keep that area open to the flow of plastic. www.novalures.com Edited September 20, 2011 by nova Quote Link to comment Share on other sites More sharing options...
tigerfire Posted September 20, 2011 Report Share Posted September 20, 2011 Would using an injector solve the problem or will the shrinkage still occur? Quote Link to comment Share on other sites More sharing options...
Vodkaman Posted September 20, 2011 Report Share Posted September 20, 2011 Would using an injector solve the problem or will the shrinkage still occur? You would still need to top off. In fact, because of the size of the bait and the small injector nozzle, you may have to top up several times. Dave Quote Link to comment Share on other sites More sharing options...
powerworm Posted September 20, 2011 Report Share Posted September 20, 2011 i hate to disagree with mark but 3/4" is not going to be enough of a sprue area for a 9" bait and an injector is doing the same thing as qwhat you are doing pouring and you will still need a larger sprue area to defeat the dents!! Quote Link to comment Share on other sites More sharing options...
Pitbull Baits Posted September 24, 2011 Report Share Posted September 24, 2011 Where is the dents or caving in at? Can you post a picture? Quote Link to comment Share on other sites More sharing options...
