I have used Rhinoliner on and under running boards and I've been very happy with it. I also use it under the fenders too.

It really helps preventing stars in the paint from rocks hitting the underside of the fenders, and it helps deaden noise.

Frank


No better smell than that of fresh paint. I've been building and painting cars/trucks for 47 years. Not gonna stop now.
http://www.coxcustomcars.com/