Don't put all your faith in this forum (or my post even) but...
Dicor does not dry rock hard, as you already found out but the prior poster will go to their grave arguing.
Scrapping away and getting a clean surface is something that can damage a roof if not done right. So you're right about if you don't feel comfortable doing it, DON'T.
Using tape may void your 10 year warranty. Tape for some reason is real big in the virtual world, not so much when you're on the road.
I'm guessing the RV shop will just clean and touch up. They'll use a bucket of soapy water, and a brush. When that's done they'll use 10% bleach water and brush the Dicor again. Wait a day to dry and then touch up. Two to four tubes of Dicror, and two hours to apply. You can figure how much labor to clean.
Now if they pull all the Dicor off and reapply, I would guess for me to do that it would be 15-25 minutes per running foot plus materials. Figure out how much time and times it by the shop labor rate.
Last note is I might even check on what can be done not to void any warranty you may still have left on your roof. You know the old saying "if it ain't broke, don't fix it."
