hp body primers

If you go on line, you can find the material data sheets that answer your questions. Here is one of them

www.hbbody.com.gr/product/index.php?pid=138

From what I can tell it is happy to be applied Direct to Metal or over polyester fillers.

My 3 step routine is:

1 Epoxy primer on bare metal ( sand with 80 grit before next layer)You could leave the car in the rain at this point.

2 Fillers or any sort on top of epoxy; usually polyesters in my experience ( start shaping with 80 grit and finish with 400) Do not get the car wet at this point

3 Urethane sealer as last coat before paint. (Sanded to 600 before paint)Urethane sealer can be applied and sanded to 600 or shot just before paint and in what is known as wet-on -wet. Urethane is fine to get wet. As a matter of fact I wet the car down after wet sanding to 600 to observe the reflections and find flaws.

A useful thing to do if you are new to car painting is to load your gun up with water and have a go at painting the car with water. This will let you work out the order of application, how to move around the car and get to difficult parts and get an overall feel for what it is like to shoot each panel. You might be surprised at how heavy the gun gets when you are reaching way over the roof or bonnet panels. The ache from your arm messes with your concentration and you make a mistake that pisses you off and causes  you to make more mistakes and so on....



By the way, painting "processes" are very confusing what with all the chemistries and formulations. So find one you like and stick with it.

Glassurit Chromate Epoxy on bare metal




Then Evercoat Body fill

Then Evercoat Featherfill Plyester high build


Then Glasurit Surfacer




Then paint. In this case PPG



I hate bodywork! At least the paind side of it!