and I am looking for comments on a few candidate materials for heat shrink tubing to be applied to a [*]CV axle. The tubing was narrowed down to these candidates using the McMaster Carr website (www.mcmaster.com : search "heat shrink tubing) : the recommended applications below are per McMaster Carr:
polyolefin : heavy-duty moisture seal - extra thick protection from damage
fluorinated ethylene propylene (FEP) : harsh environment - abrasion + chemical resistance
poly vinyl chloride (PVC) : less flexible, highest chemical resistance, UV resistant
I think the FEP looks best for a CV axle. I think adhesive-lined tubing would work best, but won’t be critical. I guess that the shrink ratio should be very low, but on the other hand as tight a seal as possible might be best for the rotational forces it would experience.
[*]CV axle (OD ~ 1-1/4 inch) is rusty, the original coating is chipped off, and needs refurbishment - it would get sandblasted, primed and painted ; or simply coated with rusty metal primer. The tubing would span either side of the CV boot, so it would sit in the grease under the boot and be exposed to the elements on the other.
also I was considering Plasti-Dip, but if the heat-shrink tubing works, I don’t see the point.