I painted another frame just recently. I use aircraft stripper. It's a gel and I put it on with a paint brush. Waited ten minutes then used a pressure washer. 99 percent of the paint was off i repeated a few times in the hard to reach areas and used a dremel with a wire wheel. I used paint from spraybike.com there bike specific paints and are pretty good I used 2k clearcoat but spray bike also has clear coat and primers. This last frame was aluminum so I etched it and then primed. All said and done I probably had 7 or 8 hours into it. Also spent at least 70 dollars. If it's a project that you enjoy then do it yourself. It's not really that hard. In my area powder coating cost around $150 for a prepared bike frame. So if you figure in your time theres not much savings. Doing it yourself you get more color options. Any vehicle you see that you like the color google that make and model get the color code and then buy that particular paint online in a spray can. The automotive paint come in a kit primer pain and clear coat for $50 or $60. I have used them before too with good durable results. And when it comes to decals I put them on very last then use helicopter tape over them.