Underbody painting/coating

[ben-xzwtw]

I’m currently restoring a car. I’d like to fully underseal and paint the underneath.
My plan is.
Panel seal any joints underneath
Scrub back any rust spots. Coat with some sort of rust proof and etch prime
Coat the whole underbody with underseal.
Finally I’d like to paint underneath the same colour as the car. Could I have paint mixed to be applied with a brush? It’s not going to be a smooth surface due to the underseal.

Those of you that have done it, what products did you use?

Thanks.

[227bhp]

2 coats of Rustbuster epoxy mastic or Raptor anti-corrosive epoxy primer kit followed by Raptor liner.

[200Plus Club]

If black would suffice I've just done my Alfa with POR15 which has brushed on very nicely and dried to a decent protective semi hard coating. Bare rust was treated first with bilt hamber oxy treatment and then por15 direct to metal on top.