Ceramic coating inside exhaust tubing

[BottleFed70 Amateur Metal Finisher Find all posts View Profile Close BottleFed70]

Hi,

Was wondering if you guys had any advice regarding ceramic coating the inside of exhaust tubing/headers.

How the heck do I coat the inside of the tubing? I read somewhere that people tape 1 end closed and dump the coating inside of the tubing and then shake it around. This sounds like I'll end up wasting a bunch of the coating. Is there another way? A spray gun/tip that you can fit inside of the tubing? What do the big shops do?

Thanks!

[CarWiz Metal Finishing Guru Find all posts View Profile Close CarWiz]

Re: Ceramic coating inside exhaust tubing

The cap and fill method works the best for the home shop. There's really not that much waste if you hang the pipe up and let it drain. (Through a paint filter.) The hard part is curing if the pipe is long.

[FigureLLC Metal Finishing Guru Find all posts View Profile Close FigureLLC]

Re: Ceramic coating inside exhaust tubing

The cap and fill method

that's how i'd do it.

[BottleFed70 Amateur Metal Finisher Find all posts View Profile Close BottleFed70]

Re: Ceramic coating inside exhaust tubing

Thanks guys, I guess that's what I will have to do.

Why would a long piece of pipe be hard to cure? Just becasue it can be hard to fit in the oven?

[CarWiz Metal Finishing Guru Find all posts View Profile Close CarWiz]

Re: Ceramic coating inside exhaust tubing

Yep. A long pipe can make it hard to fit in an oven. Most will angle the pipe diagonally bottom to top and this can give an uneven cure in most ovens. The hot pipe needs to be rotated end-to-end a couple of times. You can see how this could pose a problem with some of the higher cure temp ceramics.

[Zpider Amateur Metal Finisher Find all posts View Profile Close Zpider]

Re: Ceramic coating inside exhaust tubing

Regarding cap and fill, just make sure you let it drain fully so you dont have any buildup in any bend of the pipe. This will cause the coating to kinda bubble up inside when curing, and if thoose bubbles brake on a turbo exhaust, well, not good...

[jtagger19 Experienced Metal Finisher Find all posts View Profile Close jtagger19]

Re: Ceramic coating inside exhaust tubing

I use a soaked sponge and push it in a a couple times
I have never tried that cap and fill method