Having a roof that does not leak is very important in preserving a trailer and making it last a long time. Not to mention keeping your cargo dry is the whole point I’m having an enclosed trailer. When the factory sealant has reached its life’s end, we have found that using NP1 outlast the traditional self-leveling butyl caulk. MasterSeal NP1 (formerly Sonolastic NP1) is a type of urethane construction adhesive. It is not self-leveling, so it requires patience with a spreader in smoothing its appearance as best as possible.

We have had customers ask how long does this product last? The answer still to this day is I have not had a job come back that we repaired using NP1. With that said we continue to use this product.