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Shotblasting a Used Chassis...
scootz - 24/1/11 at 08:20 PM

Anyone done it?

How did you stop the grit from going into all the rivet holes?

liam.mccaffrey - 24/1/11 at 08:27 PM

I wouldn't do it in a word, too messy. Flap wheel in a grinder for me.

scootz - 24/1/11 at 08:28 PM

Fairy nuff!

Benzine - 24/1/11 at 08:33 PM

or those things that go in grinders that are like a soft spongy mesh, no idea what they're called but they're for stripping paint. I stripped a calor gas gottle in a couple of minutes with one and the paint of those is really tough. I was seriously impressed at the speed it did it and it's not at all aggressive on the metal, leaves a very smooth surface. I bought decent ones from a local welding supply shop.

scootz - 24/1/11 at 08:40 PM

Cheers guys!

Steve Hignett - 24/1/11 at 11:38 PM

Stop stripping, start building!!!

Onward, upward etc!!!

scootz - 25/1/11 at 10:21 AM

quote:
Originally posted by Steve Hignett
Stop stripping, start building!!!

Onward, upward etc!!!


I know, I know... but I'm building the bestest ever car! Honest!

interestedparty - 25/1/11 at 11:13 AM

What is it that you want to remove, is it rust or paint. If it's loose paint then wire brush, if it doesn't come off with a wire brush, why not just leave it on and paint over it? I think you would have to be dead keen to remove every little bit of paint mechanically, after all, each rail has got 4 sides and that's a lot of surface area, plus you won't be able to get all the paint out of the welds, unless they are super smooth and concave.

I think the big question is how long has it got to last until the next rebuild? And where is it going to live in the meantime? If the paint doesn't come off with a wire brush then leave it on. All the above IMHO, BTW

scootz - 25/1/11 at 12:04 PM

It's presently powdercoated, but is getting a bit tired.

I plan to paint it with epoxy-mastic... would the 'roughed' powdercoat provide a decent base for this paint?

interestedparty - 25/1/11 at 12:23 PM

quote:
Originally posted by scootz
It's presently powdercoated, but is getting a bit tired.

I plan to paint it with epoxy-mastic... would the 'roughed' powdercoat provide a decent base for this paint?



I'm thinking that, as shot blasting doesn't sound like an option (rivet etc holes) and stripping the paint mechanically would be quite a long job, involving fair bit of physical doings, that the answer to that question is sufficiently important to make it worth experimenting, even if you had to mix up a whole tin of the stuff.

So that's what I would do, wire brush an area, removing the loose powder coat wherever it wants to come off, and de-grease it, paint over it with the mastic, then leave it a week or whatever, and see how well it comes off when subjected to a bit of stress.

scootz - 25/1/11 at 12:36 PM

Seems like a sensible suggestion!

So this weeks priority is to get some sort of heater for the garage... waste of time doing it in the cold!