Originally Posted by Jims-87YJ
OK I have a question...I am going to be getting a nearly rust free YJ frame sandblasted early next week. Would chassis saver be able to be applied to the bare frame or do I need to Prime / prep the frame? If so what should I use? I was looking at other types of coatings but this sounds real good.
Chassis Saver must have a rough surface to stick to. So the choices to create the roughness are:
1) Tightly adhearing rust that has been wire brushed and/or scraped well to remove all loose material.
2) Mechanical roughening (by hand or power tool) to create a well scratched bare metal surface. 60 to 80 grit aluminum oxide
sandpaper works best here. Note: Wire wheel brushing does not roughen metal.
You must scratch the surface well with an abrasive material.
3) Sandblasting to a medium/coarse profile using industrial grade angular blast media.
NO walnut shells, NO glass beads, NO media blasting of any kind.
In a situation where you can't roughen a smooth metal surface, 2 part automotive epoxy primer is the best choice.
Epoxy primer does not need sanding before applying Chassis Saver but you must follow the manufacturers directions for the recoat window.
Most epoxy primers can be recoated as soon as they are fingernail hard. If left too long, topcoat adhesion could be compromised.
48 hours max is likely the right thing but do read the directions since each product varies.
If ever you have previous paint on isolated spots when you are coating with Chassis Saver you can coat over them.
Just scuff sand well to remove all remaining gloss of the old coating.
The only other thing that can mess up a Chassis Saver project is grease or oils on the surface. A good commercial water base
degreaser can be used (Simple Green or Zep). Allow all surfaces to dry thoroughly before coating.
And lastly, Never use Lacquer Thinner to wipe surfaces prior to coating with Chassis Saver. Acetone, MEK or our S8 Reducer works well.
Lacquer thinners are blends of solvents and typically contain high levels of moisture. I have seen Lac thinner create all
kinds of wierd problems with Chassis Saver so avoid it like the plague.
Also if spraying Chassis Saver and your spray equipment has been previously been cleaned with Lacquer thinner, you must flush
the system well with another solvent before loading it up with Chassis Saver. Same solvents apply as above.