Preparing chassis question

tomhop · Apr 11, 2016

The chassis on my series 3 is an old galvanised one, the galvanising is coming away in areas so my plan is to power wash the chassis use a wire brush to clean up any rough areas where the old galvanising is coming away, paint it with red oxide primer then Frost's chassis black over the top. is there any thing wrong with using red oxide primer (i have a free plentiful supply of it) or should i be using some thing else?

Flossie · Apr 11, 2016

Red oxide is just a colour now.
I would use a cold galv paint then slap whatever on top of that.

Rattlegun · Apr 11, 2016

I don't think proper galvanizing can come away, it bonds with the steel at a molecular level. Could it be an old galv paint treatment?

tomhop · Apr 11, 2016

Rattlegun said:
I don't think proper galvanizing can come away, it bonds with the steel at a molecular level. Could it be an old galv paint treatment?

the stuff that has come off is quite thick and flaky not like paint and underneath it looks like surface rust. it looks to me like water has got in then frozen and burst out the layers but the actual chassis looks qquite good under the surface rust, i will try and get a picture up tomorrow.

tomhop · Apr 11, 2016

i suppose the other option would be to send it off to be shot/media blasted then galvanised again

tomhop · Apr 12, 2016

here are some pictures, any thoughts i was told it was an old galvanised chassis and it definitely looks like one. I got a quote back from Scottish Galvanizers Ltd to shot blast and galvanise the chassis would be £250 + VAT which i thought was pretty good and they seem to get a good review. only trouble is i would have to deliver it and collect it from Glasgow area which is a pain,

blue beasty · Apr 12, 2016

I've never seen galv blow. Rust will eventually come though but that's different.

I suspect it's painted as well.

Flossie · Apr 12, 2016

tomhop said:
i suppose the other option would be to send it off to be shot/media blasted then galvanised again

I wonder if it was metal sprayed rather than galved? That can flake off if the blasting isn't done right.
If it has, that stuff can be a bugger to blast off.
I'm no expert but I've not seen galv flake off but metal spraying can.

tomhop · Apr 12, 2016

Just spoke to the local galvanising company (didn't realise I had one) they will galvsnise the chassis for £250 + vat so think I will finish dismantling it take it to the local shot blaster and get it done right

Stretch · Apr 12, 2016

Well it looks like you're off down the galvanising route but if you want to paint over it I think you need a different sort of primer than red oxide. I don't think that stuff from Frost will go well over a galvanised finish either...

tomhop · Apr 12, 2016

so new plan strip and galvanise then mordant solution then chassis black paint? or should there be some kind of primer after the mordant solution?

tomhop · Apr 12, 2016

any one have any pictures of a series with a unpainted galvanised chassis wondering how it would look unpainted?

tomhop · Apr 12, 2016

I meant to put in a etch primer after the mordant solution before the chassis black paint

dominicbeesley · Apr 13, 2016

Richards chassis recommended mordant wash, then etch primer, then Jotun Conceal - it's an expensive chassis black and goes on quite well. I suspect I should have thinned it and done serveral layers instead of one two too thick layers...

John S · Apr 13, 2016

Anywhere galvanized steel surface is broken it will rust i.e. any holes etc.

blue beasty · Apr 13, 2016

tomhop said:
any one have any pictures of a series with a unpainted galvanised chassis wondering how it would look unpainted?

Beautifully stealable

tomhop · Apr 13, 2016

blue beasty said:
Beautifully stealable

why would a galvanised chassis make it more steal-able?

Flossie · Apr 13, 2016

More desirable to the thief's he meant.

tomhop · Apr 13, 2016

sounds like painting it would be the right thing to do, another layer the metal worm has to get through before it can start eating it!

Disco1BFG · Apr 13, 2016

Flossie said:
More desirable to the thief's he meant.

And, lets face it, they seem to be quite popular with the sticky fingered types at the mo

Preparing chassis question

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