no surface rust at all anywhere that I can see 

Sand and spray your high build.  I’m not to that point yet and products have changed a lot since I last painted anything.    I’ll ask my buddy what he suggests.   Which he was suppose to give me list so I could go buy the high build primer for my project.

Looks like I will be using Vibrance primer.

True74yamaha wrote:

I really like SPI epoxy primer brushes/rolls on nicely where you cant spray or when primer just needs to be applied in small amounts. Sands nicely as well. Im debating using SPI high build primer or keystone 3 in one that works as sealer medium build or high build sands amazing. The only down side is when its used as a sealer can be gritty not smooth like a true sealer. If it was me the etching primer should be sanded and scuffed in all areas to remove shine. I would make sure the etching primer states it can be top coated with a universal top coat or similar. It would be horrible if it doesnt state this could cause big issues. I would sand every where with 80grit. Most every manufacturer states 80grit being first step to give the surface good bite for proper mechanical adhesion. Another good product to use to remove surface gloss is surface deglosser sold at lowes or depot. Works good in tight areas you would have to hand sand.

SPI is seriously good!
 

MS wrote:

80 grit?  Sounds kind of rough.

No kidding.

Depends on  the primer some guys spray liquid bondo aka  Evercoat Feather Fill  with a 3.0 tip then after its dried sand the primer with 80 grit. This will tell you all your body flaws with in. Seconds. Some people like this way and then they follow up with filler for the lows then spray some more feather fill. Lots of ways to skin a kat.  If were talking bare steel from beginning to end 80 grit the panel first apply epoxy or DTM has to be DTM good thing to look for is if the primer your going to be top coating the etching primer with is compatible with the underlying layer for your case. Follow with high build primer 3 wet! coats... Block sand with 180 grit. Wet sand with 400 for solid colors wet sand with 600 if mettalic and wet sand with 800 for really nice black jobs. Depends on the prepper. Also like to use guide coat when wet sanding with 400. This will also show any flaws easily.