Internal Frame Rust Protection

Here's a quick tutorial on how to spray Boeshield T9 coating into a steel bike frame.  Six minutes, but if your bike's already built up and you don't want to disassemble it to do this treatment, skip to the four minute mark.  Looks dead easy.

The real trick the guy uses is an extra-long spray hose to get way up into the frame.  Look in the video's drop-down description for an Amazon link to get these.  Never seen them anywhere before.  What a great idea.

ps, Thursday 8/28: This was a far messier project than I'd anticipated.  Of course you'll have to do the job outside or at least in a workshop.  With disc brakes do not repeat do not repeat do not get any oil on the calipers and pads – which means covering them with plastic bags and taping things down securely.  Even so, be careful.  If I had to do it over, I'd remove them entirely except for the cable, bag over the entire assembly, and seal the one opening securely with tape.  Even one drop of oil and those brakes will squeal like a banshee until you clean everything and replace the pads.

So, set things up inside.  Remove the bolts needed to get the extra-long straw up into the frame, remove the wheels (got to keep the oil off the rotors!), and mask anything you've got to mask ahead of time.  Then haul it all outside, go to work, and get it cleaned up before bringing back inside.  Might want to let it sit in the hot sun for a few hours if you can before bringing back inside.  It's a mess, but worth it for a bike you might keep for decades.