This did fill scratches. I used it on a 3d print that was not perfect, but I needed a smooth finish. It took several coats to fill the deep ridges, with sanding between coats. It layers everything, not just the scratch. So you have to sand the tallest layer down in order to get the smooth finish.Sanding with 220 grit took it down easily, but did gum up the sandpaper a little. That was easily fixed though. When I moved to 320 grit my paper clogged after 2 passes and it was just done. I did not wet sand, but in hind sight this would have most likely helped. Anyways, without being able to use my 320 grit well my final paint had a lit of scratches in it still from the 220.It is soft, very easily dented, scratched, chipped. I used it for a project at work and had to keep redoing it because someone simply picked up the model incorrectly. Eventually I hid my model so they'd stop screwing with it. If you're delicate this stuff works, but handle it wrong and you'll be redoing it. Once the final paint and clear are on you're ok as long as you're not tossing the object around.It's expensive, but worth the cost for the convenience.

It's a good product. My family uses it for auto body. I thought I'd try it for my projects...although I didn't know that I could purchase locally and save $10.

Read instructions extremely carefully in a bubble If you touch it I will get all over hands so be careful when using If you don't wanna end up sick make sure you put a mask over your face I prayed the stuff in and I ended up coughing for over three weeks