Yeah, but as soon as you weld, or cut, the aluminizing burns off.
You could go all the way and have the pipe high temp coated inside and out, or, maybe just clean it out inside very well with solvent, scuff it, dry it and pour some liquid paint in there, slosh it around and pour it out? Unless the section is very short, aerosol won't work well without the wand attachment.
Maybe someone has some more effective suggestions..?
Tim