Earlier this week I was checking out some DIY stuff on interior plastics around the net. I saw a product in some write-up that was like a plastic filler of some sort; like for patching holes, cracks and custom work like LCD's. Now, I can't remember where I found the write-up, or the name of the product

Has anyone used a product that works like this? It's not Bondo or epoxy. I'm at a loss here

Thanks in advance y'all