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		 your on the right track- if your heating up your plastic with a microwave, id suggest getting a 2nd one. 
The way you made your model is exactly the way i made my first surfhog models and your right, you have to seal that wood nice and good- any texture will transfer into your mold.  
Once you get a bait that you like, you can pour something that will harden up solid like liquid hard plastic and make as many models as you want to make a larger production mold. For my surfhogs, i made a mold with 20 cavities- (I measured the volume of each surfhog and divided it by the volume of a large pyrex measuring cup- so if i filled that cup to the top with plastic, i could just pour 20 baits..  
to get the  plastic to cool a bit faster, you can angle a fan blowing down on the mold- it helps a little.  
good luck- I dont miss that molten napalm one bit.. dont burn yourself!!!! 
		
		
		
		
		
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