Maybe u could figure out why its yellowing if you know who made caney creek now do it plastisol. Maybe you will find the answer there. As for burning plastic isnt yellowing moving toward the direction of burning, scorching?? If he did micro in 30 sec burst and stir in between 30 sec burst maybe it wouldnt yellow. In the first post I think I read where he had it in the micro for 10 min then 1 min burst.