WR1 Owners Club

Has anybody used ie Dintrol / waxoyle on inner arches etc?

Removed all wheels for good inspection of inner arches all seems ok bar the back inner arches, no corrosion present but seems 75% covered with stonechip underseal and outer 25% to lower lip inner edge of arch just painted ?
all same colour as car? dont really want to use black underseal? but you can see evidence of impending problems in the future ie stone chips on the painted area of the inner arch. I dont see many or if any rusty scoobs, so am i being a bit anal here?

Any ideas or any treaments that have been used?

Dynax ub seems to be the product prefered, but im not going to treat the full inner arch, just the painted area.

I noticed some of the original underseal at the back was peeling, so I got it all off, jetwashed under the arches and the day after thoroughly Waxoyled everything. Can't see it doing any harm. Also plan on doing the bits underneath that I can get to.