Morris Minor Owners Club

With a bit of luck ill be stripping and painting the underside of the car in the next few weeks. The plan is to use chassis black and tetroshutz (or however you spell it!), but i was wondering what the best paint is to apply to the bare metal? Do i reach deep into my pockets and get the POR-15 rust preventative paint or just slap on a lot of zinc rich primer?

thanks,
YG

You want a primer that will give maximum grip for the chassis black to prevent flaking. The two I have used and both give eaxcellent results, are Bilt Hambler, or #1 Rust Beater Primer by Finnigans.

Hmmm, ive heard of neither! thanks moggytech, ill google them both!

I've often wondered on this question, but what has paid off for me is ---zinc primer (bonda) followed by hammerite smooth ( I know some folk hate it) then cover (not too thick )with waxoyl underseal and a few weeks later sprayed with normal waxoyl, which can be repeated every few years. Ten years on all ok.

Yup i just used hammerite on mine, the only hammerite I had in the garage which turned out to be white! Made out for a pretty underside!

for me- Zinc primer (90% zinc =heavy tins), seam seal any welds, chassis black, then underbody wax (waxoyl/Dinitrol). For high impact areas, use overpaintable stonechip coating before the chassis black coat.

"tetraschultz" I think is underseal, personally, I wouldnt use that.

Hmm, well i rekkon its going to be a shed load of seam seal, zinc primer, stonechip, chassis black and waxoyl then.
Thanks people!

If you go the seam sealer route cleaning first with thinners is a good plan. Mind you it's a good idea to have continuous welds underneath, in which case seam seal is redundant.

Not if your welding's like mine, it isn't

les wrote:If you go the seam sealer route cleaning first with thinners is a good plan. Mind you it's a good idea to have continuous welds underneath, in which case seam seal is redundant.

Agree that continuous welds are the best- certainly for MOT purposes. However, even a visually completely continuous appearing weld can have a few tiny pinholes or tiny gaps, corners etc where moisture can get in and start rusting so I like to dress the weld down to get it even with the grinder, then wire brush on drill to clean it up, as you suggest, clean with thinners (or panel wipe) then zinc prime, then seam seal. Chassis black, then waxoyl.

My view is its belt and braces, after doing all that work on the cutting and welding side, I want the repair work to last.

I like to dress the weld down to get it even with the grinder

I share your obsession or should I say care!