Hey Linda
Also, I've had good luck using bedliner paint. It seals well and isn't as thick and gunky as off the shelf undercoating.
If it is your intention (although probably not) to do a restoration on your 67, as a technique, you might want to spray the undercoating on and then more thoroughly apply it with a mitt as they did in the factory. Original undercoating was usually only applied to areas that could be reached by hand. Just an obsessive compulsive thought migrating in from the NCRS.
Cheers n' gears//Mike
