The makers of Eternabond now make and sell Eternacaulk in clear, black and white. Google it. It is $9.05 per tube. I bet it is good.
Proflex is also a good product. Just don't use silicone. It won't adhere.
Steve Rinker
Rochester, NY
2013 Keystone Sydney 340FBH 5th Wheel, 12,280 lbs loaded (scale)
2015.5 GMC Sierra Denali 3500, SRW, Duramax, CC, Payload 3,700 (sticker- not scaled yet)
Take my posts for what they are, opinions based on my own experiences.