I have not used one, but have seen repair kits in auto parts stores.
I have the impression that you have to have a good eye to get a good color match. There were several base colors you mixed to get the desired color.
Might be worth a look.
Clay WA5NMR - Ex Snowbird - 1 year, Ex Full timer for 11 years - 2004 Winnebago Sightseer 35N Workhorse chassis. Honda Accord toad.