I have a 4 into 1 Hindle. The front two pipes even though they looked like originaly coted are starting to corrode, Also some back near the aluminum muffler. Can these be recoated?
Another option you may consider is to wrap your pipes with titanium wrap from DEI (design engineering incorporated) they carry thermal products to control heat.
I tried this and was pleased with the results keeping heat away from the carbs and air box as well as covering the underside of the air box with heat tape. I noticed a difference on hot summer days stopped in traffic.