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Old 08-16-2016, 02:21 PM   #1
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1971 18' Caravel
1970 27' Overlander
Vintage Kin Owner
Hawthorne , Florida
Join Date: Nov 2015
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Other Urethane caulks (NP1, OSI)

My handyman advocates NP1 (Master Seal, formerly Sonolastic) for flexible, long enduring joint sealing. The label says it's a high performance polyurethane sealant. It this an ok substitute for Vulkem 116?

Lowes carries OSI Pro-Series 10.2 Oz. Polyurethane Door, Window, Siding White Sealant, which also looks like it might work on aluminum and is rated for 50 years. Is it any good?

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Old 08-16-2016, 04:07 PM   #2
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1999 34' Excella
Davidson County, NC , Highlands County, FL
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I have used NP1 extensively in commercial construction. I also used it on the exterior of my home. It's a really good caulk for its intended uses. Though, I've found the colors fade when exposed to sunlight? It would probably be ok on your trailer for large joints (around windows, doors, awning rail, etc). But, I would not use it on my trailer.
2014 Silverado 1500 Crew Cab 5.3L maximum trailering package (yes, I'm towing the 34')
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