Window tint repair- is it possible

Just had the tint done on my boat. Sister in law gets on with rings, who knows why and nicked some spots on the tint. I know it should be replaced but was wondering if anyone had touched up any nicks on tint before and what they used. I know there is nothing that will be an exact color match, just looking for ideas so it blocks the light. It's a 20% tint. I did call the shop that did it and they said it had to be replaced, but there are a lot of intelligent and experienced people on this site and I thought maybe someone has some experience with this. Thanks.