Here are a couple pics of items I restored using RPM from ECS. The 1st is a driveshaft. We restored the driveshaft, ends etc. We applied the RPM to the pourous ends by heating the area, then appying the RPM with a stiff bristle brush. The warm part melts the RPM and it flows out evenly to seal the porous cast surface. It is very easy to apply. On the main surface of the shaft, the RPM is simply applied with a cloth (wiped on like wax). It does not change the look or coloring of the part at all.