Paint Over Phosphoric Acid Treatment

Do I need to do any prep after OsPho application before painting the treated chassis underside.

Right now I have the glossy day after stage of OsPho curing.

Also - I'm using a gloss black oil based industrial paint.

Should I use something else for a longer lasting paint job.

I want to do it right ONCE!

Thanks - Bert

Might look into POR-15 for your frame .
I dont know enough about oil base paints to give you any help , but POR -15 bites to metal good , and drys to a very hard finish.
They also have a metal conditioner that can be used for better adhesion too.