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Mold Making & Casting Class
Simple Sheet Metal Brake: No Welding
I had this problem in Florida. I let the car set in the sun all day. Then i worked at the dent as you did from the underside with a handle from a plunger. Pored hot water on the dent. It poped out. Emedatatly poured Cold water on it to set the plastic. It kept the original shape.