John, you're using One Grand ERV....did you find a way to remove the R/R, or does that stuff successfully go on top of R/R? I've even thought of using some super fine sandpaper and just ever so lightly sanding everything, hoping it would open up some pores, that I could then soak with 303 or the TS-1.
Yes, it wiped right over the top, but then the R/R has been on for over a year. As far as sanding, think I wouldn't. You would be dubbing contaminants into the substrate it's self. Seem's like I read to use turpentine to remove R/R.