dicor caulk

Doing a search, should bring up some threads with lots of answers.

I would use a plastic scraper, like for your windshield, and maybe use a heat gun, being very careful, not to get too hot.

If your RV is not too old, and just has cracks, or pin holes in the original dicor, I'd just clean the old, and cover with fresh.

Jerry

Just caulk over unless it is really bad.

How do you tell if its Dicor.
Lots of other roof sealant brands have been used on RVs.

I would follow your roof membrane manufacturers recommendations on using any product up there.

I remove loose sealant and use self leveling Dicor and make it like OEM. Others use similar products.
For hairline cracks in the sealant I do as Wyo says and just add a small layer over it.
Keep in mind when adding a lap sealant you don't want to make a dam up there for water to sit in.

In talking to an RV tech friend, he said just remove what you can with your fingers and then cover over what is still there. It flows into the cracks and crevices so you dont have to worry. He did suggest taking a sharp knife and where it is cracked, widen the crack a little to ensure the new stuff flows into the crack better. He said you will likely do more damage to the roof trying to remove the old stuff.