Resqcapt19
Thats an excellant question. The reason I chose the markers seemed to be a quick solution and its permanent. In my haste I never thought to ask the most important question, what would this stuff do to the insulation. I just assumed the insulation would be impervious to any type of solvent not even that it will but there is always that chance it could and the marker is certainly not listed for that purpose.
However it does say to paint it or some other means of permanent reidentification, Iam going back to the tape method, its never failed before.