Primer before Niscocoat 2?

[Poobah]

Hi, I'm restoring the underside of my car and have applied Jotamastic 90, then 3M 08800 sprayable sealant to the underside. I now want to paint this with a final top coat and am considering using Niscocoat 2.

Given that the 3M sealant is freshly applied, do I need to apply a primer before applying the Niscocoat 2 or can the Niscocoat 2 go directly on top of the sealant?

Any help would be greatly appreciated.

 

[steveo3002]

id go straight over the sealer

 

[Poobah]

Thanks for the response. I'm in two minds what to do after the 3M 08800 to be honest. I don't feel massively concerned as to whether I leave the underside of the car in the grey finish of the 3M, or paint it, but I do want the arches to be OEM finish (which I think would be black rear arches and white front arches) so need to do something in the arches.

Tricky to know whether the 3M sealer but painted over in 2K would be durable enough for the arches, or whether I should fire some sort of black PU stonechip over the top of it instead?

Any thoughts on the above waffling would be great.

 

[barracuda816]

I would prime over the sealant. For no other reason than the single stage will all be going over the same undercoat and it is a known that it won’t react with the jotun.