I've searched high and low and everywhere in between

I have some of the old bottles of the "goop" and it says lamrites and plastical. I have searched for both of these and posted on others forums and I got alittle help, but not much.
So my mom would make these molds out of aluminum, then paint the "goop" on color by color, then cook it in a little broiler oven. When it was done cooking she would let it cool, then peel it off the aluminum and it would stick to glass. They werent transparent and they last forever. She still has alot she made over 30 years ago but we were trying to get back into making them. I hope this explains it better for you. Thanks for any info I can get and for taking the time to read this.