Good quality butyl sealing tape is hard to beat for water intrusion and dealing with all the flexing of a camper towing down the road. But it does have that one attribute of being a dirt magnet.
I have found using Dicor non-leveling sealant over the exposed edge of butyl works real well. I have used it a lot of it and it lasts a good long time. I'm going on 10 years on the front top corners I used it on first. It has over 25K miles of towing and still no splits and is adhered to the aluminum over the butyl. And the camper lived outside for that last 10 years before the new barn came to store inside.
EPDM Lap Sealants | Dicor Products | Official Website
I use the 551LSW white. Non sag for vertical surfaces.
It takes some practice on how to apply, I find a real fine cut tip on the caulk tube, then use a water wetted finger (dip in water) and smooth out, creates a nice finish. I also have used masking tape and peeled it off before it cured which also worked.
This type will not run on vertical surfaces, is very cleanable, bonds to all the camper surfaces (butyl, aluminum etc) and it can be removed some day if needed.
Hope this helps
PS I did look up the Quad from your note. Window Sealant | Window Caulking | OSI QUAD MAX
The statement about do not use in continuous water applications did not make me feel great. Granted when used on a house or a camper, hopefully it is not continuous wet. Would like to know why they stated that. It is in the tech sheet too http://www.ositough.com/content/dam/...ad_max_tds.pdf
It looks really good for a house application.
Current Sunlines: 2004 T310SR, 2004 T1950, 2004 T2475, 2007 T2499, 2004 T317SR
Prior Sunlines: 2004 T2499 - Fern Blue
2005 Ford F350 Lariat, 6.8L V10 W/ 4.10 rear axle, CC, Short Bed, SRW. Reese HP trunnion bar hitch W/ HP DC
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