Kwalter32 Posted May 12, 2019 Report Share Posted May 12, 2019 Heated it in a bunsen burner and the temps would get to 320 then drop then back up. It started steaming and smelling burnt and now its yellow with a glob in the middle that wont mix in Quote Link to comment Share on other sites More sharing options...
Driftwood Posted May 12, 2019 Report Share Posted May 12, 2019 Yeah, I would say its burnt. Anytime you get smoke, the plastic is to hot and needs to be cooled off before burning beyond use. I would try stirring as you heat it to keep a more uniform temperature until you get a feel for how fast the bunsen burner heats up. Quote Link to comment Share on other sites More sharing options...
Kwalter32 Posted May 12, 2019 Author Report Share Posted May 12, 2019 1 hour ago, Driftwood said: Yeah, I would say its burnt. Anytime you get smoke, the plastic is to hot and needs to be cooled off before burning beyond use. I would try stirring as you heat it to keep a more uniform temperature until you get a feel for how fast the bunsen burner heats up. Ok thanks. I figured the some was just from it getting hot. I stir it with the thermometer needle but it seems to jump around on temp since the burner goes on and off 1 Quote Link to comment Share on other sites More sharing options...
nova Posted May 13, 2019 Report Share Posted May 13, 2019 I wouldn't mess with a burner. Get yourself a hotplate. Much easier to control heat. Quote Link to comment Share on other sites More sharing options...
bryanmc Posted May 13, 2019 Report Share Posted May 13, 2019 Grab a cheap microwave... it's much more user friendly. 1 Quote Link to comment Share on other sites More sharing options...
nova Posted May 13, 2019 Report Share Posted May 13, 2019 If he's using those pouring cups he can't put those in a micro. He'll have to get pyrex cups to do that; But I do agree that a micro is easiest of all. Quote Link to comment Share on other sites More sharing options...
Kwalter32 Posted May 13, 2019 Author Report Share Posted May 13, 2019 I bought 2 pyrex cups also to use the microwave but I figured the burner would be easier to keep an eye on the temps with. Only made one batch since the plastic kept dripping down the side and starting a fire. I dint recommend that method to newbies lol Quote Link to comment Share on other sites More sharing options...
Les Young Posted May 13, 2019 Report Share Posted May 13, 2019 I would definitely get a microwave. Easy peasy 1 Quote Link to comment Share on other sites More sharing options...
McLuvin175 Posted May 14, 2019 Report Share Posted May 14, 2019 It might be only 320F where your reading with your thermometer; especially if it is an IR type. Right where that flame is hitting that pan that plastic is probably easily 400F +. Its called a "hot spot". Constant stirring will help but with that setup you'll never not burn plastic. For a small amount like that you cant beat a cheap microwave. Did you add any hardener to that mix? That may explain the blob that wont mix in. 1 Quote Link to comment Share on other sites More sharing options...
Kwalter32 Posted May 14, 2019 Author Report Share Posted May 14, 2019 11 minutes ago, McLuvin175 said: It might be only 320F where your reading with your thermometer; especially if it is an IR type. Right where that flame is hitting that pan that plastic is probably easily 400F +. Its called a "hot spot". Constant stirring will help but with that setup you'll never not burn plastic. For a small amount like that you cant beat a cheap microwave. Did you add any hardener to that mix? That may explain the blob that wont mix in. I have hardener but wasnt sure how much to add to 4oz of plastic or when. I'm just going to get a microwave for the garage. Quote Link to comment Share on other sites More sharing options...
mark poulson Posted May 14, 2019 Report Share Posted May 14, 2019 28 minutes ago, Kwalter32 said: I have hardener but wasnt sure how much to add to 4oz of plastic or when. I'm just going to get a microwave for the garage. Be sure you mix in your hardener completely before you heat your plastic, or you will get lumps. Quote Link to comment Share on other sites More sharing options...
wallyc14 Posted May 16, 2019 Report Share Posted May 16, 2019 On 5/14/2019 at 11:18 AM, mark poulson said: Be sure you mix in your hardener completely before you heat your plastic, or you will get lumps. +1 if your using the thicker type hardner you will want to add some heat stabilizer . Mix the crap out of it . In general my rule of thumb is: 4 oz soft plastic teaspoon of hardner gives me medium soft table spoon gives me a medium hard both require 5-10 drops of heat stabilizer 1 Quote Link to comment Share on other sites More sharing options...
Cub48 Posted May 21, 2019 Report Share Posted May 21, 2019 You need a thicker pan the thin metal will hot spot with the burner. I will agree with the others on microwave thrift stores are a good place to get one cheap or a return store. Also some plastisol turns yellow easier than others. Been there done that. Mix with black or dark colors when u get some that yellows Cub48 1 Quote Link to comment Share on other sites More sharing options...
rockslide Posted May 24, 2019 Report Share Posted May 24, 2019 you need a light dimer for that burner! but a hotplate is much easier to control the temperature 1 Quote Link to comment Share on other sites More sharing options...
