how to perform the outside technique safe and easy 

watch the deepest when you pre-cut and don t go to close to the edge side quarter panel and that's all

I’m would like to know as well

you can have t at vd-k tools

Hey bud, WRD sells those strips but you can also buy a pack of 1/32 inch thick polycarbonate sheets off of Amazon for about 10 bucks and cut them to size. I got a 5 pack of 8 inch by 10 inch sheets and I cut one sheet Into about 16 strips, and I have plenty more sheets for future use.