Problem Plastic is an awesome product. Dries fast and sands really well.I’ve also had a long history with SEM problem plastic repair. Usually fix from backside with mesh tape then v grove the front cracks and do them with just the SEM. Have also melted some cracks/tabs, etc back together with a large soldering iron before. And use strips off a old cover for filler material if needed. Usually on my own stuff. Always seemed ok.