Which paint / primer for frame

[55metalmonkey]

Originally Posted by duwem

Isn't the point of POR 15 for Painting Over Rust? If he has a clean frame that has been sandblasted I would think actual primer and paint would be what you want???

Not always, if you have it blasted clean you should use zinc phosphate (aka: POR metal ready) on the bare frame, then coat with POR-15, if your worried about oxidization of the POR or if it's going to get sunlight occasionally you need to top the POR with a good self etching primer or "POR tie coat primer" the top coat with the color of your choice. When I did mine I went a little over the top on rust proofing but here is what I did
1:media blast to SSPC-SP5 (Nace#1) white metal blast
2: 20-30 minute soak of zinc phosphate (metal ready)
3: two full and heavy coats of POR-15 (on rotisserie with proper dry/ tie times)
4: 2 coats of tie coat primer
5: 2 coats of top coat

For Matshark POR-15 should be available in Germany, in reality it's just moisture cured epoxy paint which meets the low VOC standard. If you can't find it POR any decent paint store should have a moisture cured epoxy paint, the only difference is brand name. One thing to note if you prep with zinc phosphate don't use a oil based paint it will cause soaponification and delaminate

As for waterbase paint it's not much different unless your trying to run a production shop, different tips and cure times but in many ways it performs better.