Don't...
sand blast it! Now, if your friend can use plastic beads instead of sand, that will work great. Sandblasting a bike frame is very harsh on the steel. The plastic beads will just remove the paint and any filler.
Yes, you will need to coat the frame to prevent rust, especially if you sand blast it.
I would check out the bottow bracket area before you spend to much time on this project, be sure there's no bad rust there alreadly. My old Giant rusted really bad.
When your done with the paint work be sure and coat the inner tubes of the frame with FrameSaver or some other rust preventer.
Have your friend paint the frame with a nice auto grade clear, or use Imron if your budget allows. Don't worry about the weight of the paint, its nothing.
Post some pics of your project when your done!
MC
chris_nor_cal said:
I'm going to make a single speed out of my dad's old 1993 rigid steel Giant Iguana. I think its a perfect bike. It looks like many of the bikes I see on this forum, and I've always wanted to try singlespeed. My question is as follows: I'm going to have a friend blast the paint off at his shop and he said he could clear coat it for me. He seems to think this could add alot of weight to the frame, is this true? Is there anywhere i really CANNOT get sand or paint it? I'm goign to stuff the seat tube, BB, and head tube with newspaper or something and tape it off. I think I might like just the paint-less steel look. Do i need to coat it to prevent rust? Do I need to know anything else?