First, GOOD CATCH, you saved yourself a LOT of grief and money by finding this early!!
This material will work too, and does not dry and crack over time like Dicor does.
VERY easy to work with, flexible and long lasting stuff.
I used it on all my edges, seams and all roof penetrations as a precaution when we bought a 3 year old camper 5 years ago.
No leaks, No problems so far.
2012 Wildcat Sterling 32RL, Gladiator Qr35 ST235/85R16 Load rating G, TST 507 TPMS w/ Flow-thru Sensors & Repeater, Reese Sidewinder 16K Pin Box, PI EMS HW50C
2008 Chevy Silverado 2500HD CCSB LTZ Diesel, Fumoto Oil Drain Valve, Turbo Brake activated, 39 gal Aux Tank W/ Fuel Pump transfer, Air Lift Loadlifter 5000 air bags.