Newbie question here: I am trying to repair some plastic buildings (don't know what type of plastic) that have various cracks, imperfections, and chunks of plasticmissing. My goal is to repair the plastic on these buildings, sand them smooth, and then coat the entire building with some sort of plastic liquid(?) or some sort of thin liquid that will fill in the sanding scratches and any other small imperfections left behind, leaving a super smooth finish on the end product. I've kind of stumbled my way through the repairs using some clear epoxy resin. It has allowed me to fix most of the bigger cracks and missing chunks, but I need some sort of liquid that I might be able to pour on top of the building and let gravity take it to all of the low spots to fill in any of the small imperfections and give me a finished product. I hope that I am being descriptive enough. By the way, I have tried using Krylon's triple thick coat spray on an older building, but it doesn't really seem like it wants to entirely stick to everything like I had hoped it would. I prepped the building first by wiping rubbing alcohol on it to remove any dirt or greasy film. Any help is appreciated. Thanks.