wonderfull basement waterproofing material, if you need to waterproof your roof it's good stuff, but it will make the bus hot in summer, when i resealed the roof on my 28' cargo trailer I used the silver reflective roof sealant from home depot, 5 gal $40 brush on, it works well without absorbing heat in the summer.
the hot ticket on this forum is to use white paint and koolseal addative on the roof to eliminate as much heat as possible.
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