Rass is a converter, supposedly turning iron oxide into an inert substance that then can be painted over. In and of itself, it provides NO rust protection and must be covered within a reasonable period by a coating of some kind.
In our experience, especially given the fact that you've already sandblasted, it is a redundant step (& expense) in the process of protecting your steel. Our Zero Rust can be shot directly on the white metal without the use of any converter, thus saving that step & expense and STILL give you protection. We have found that the "residues" from use of converters actually will interfere with paint adhesion, thus hindering the job that the rust inhibitor is designed for.
There are some ZR users right here on your forum that can probably offer some first hand experience themselves. IF not, Len Stuart at
www.autobodystore.com is a Rass advocate and you can check his forum for any number of discussions about its use, ...
HTH
WK Irish
