Rust on Inside of Tubes?
 

So begins my first fixed gear conversion project. Got a 1983 Miyata 310 and have begun to strip it..braze ons and paint, and some minor surface rust. (No problems yet with sandpaper, but may try stripper). My question though, is, what's going on on the inside of the tubes? As I look into the bottom bracket shell, I see lots of dirt and corrosion.. same with up the fork looking into the head tube. Should I be concerned about rust here? Do I need to get this cleaned up and primed before I begin to paint?
Thanks.
Many more questions to follow, thank you.
Glenn

Yeah, clean it up, but also get some Frame Saver and give it a treatment.

it prolly will rust from the inside out and break, there are products available to convert that rust or stop it dead, just pour it thruout the frame.

A fairly common solution is to carefully cut the tubes open, remove the rust and then carefully weld them back together. If done correctly, it has no adverse effects on the frame, and is just about impossible to detect by the naked eye.

Thanks. Weigle's Frame Saver it is!!
Glenn

Or, you could save some money and use boiled linseed oil.

I just finished treating the frame of my '82 Trek with boiled linseed oil. It's kind of messy to apply, and it tends to drip all over the place, but once it sets, it's like varnish. If you go this route, however, make sure you clean the outside of your frame really well before it sets, otherwise it's a ***** to get off.