Underbody Painting and Protection

[JonnyAlpha]

Sorry this has been asked by me and others on several threads but on looking back I just need some clarification:

I have cleaned up the underside of my Mini Restoration to bare metal as I have been working on the project and to prevent any rust it has one coat of Epoxy Primer (Joton Jotamastic 87) this was applied with a mix of a brush and mini roller.

I am running low on Joton and originally was going to apply two coats before Seam Sealing or is this overkill, if I don't will the following plan be OK:

1. Epoxy Primer
2. Seam Seal
3. Gravitex
4. Cellulose Top Coat

I have read that the Gravitex can react with the Seam Sealer so I was going to do another coat of Epoxy but as I am low I do have some Cellulose Primer which I could spray after Seam Sealing and before the Gravitex.
I was also going to put a coat of Epoxy after the Seam Sealer but in response to another thread was told its not required?

After step 4 does anyone recommend anything else (I have seen suggestions of using Waxoyl)

Thanks

 

[bc30se]

I don't thing the schutz will react with the PU sealer... I did such a composition many times and I didn't suffer because of it..

Personally, I use the elaskon...

 

[Wallace]

Don't lay the Gravitex on with thick coats, apply lots of thin ones with time in-between coats to allow the solvent to flash off. I had a reaction due to a faulty Schutz gun that laid too much on and lifted the Epoxy Mastic 121 off the steel like paint stripper and ended up stripping a whole floorpan back to bare metal.

 

[JonnyAlpha]

So one coat of Epoxy is OK then?
And no primer over the sealer or Gravitex?

What about timings between coats and sealer etc.

 

[steveo3002]

few light coats of gravitex until youre happy with the finish , depending on the weather and how much you put on let it sit an hour or until its gone dull looking , then on with the topcoat

 

[langy]

So one coat of Epoxy is OK then?
And no primer over the sealer or Gravitex?

What about timings between coats and sealer etc.

Underneath a car I put on 3 good coats of 2 pack epoxy then Gravitex, then topcoat, pretty much bulletproof