DavidB,
In the interests of a more comprehensive evaluation !!! & of course American / European relations, it would be great to test this
mystery sealant across the pond as well. As we get much more rain than you guys Stateside, (not to mention, the four seasons in one day), its the perfect place to start. From the home of your favourite tipple ... The Magic Black Stuff !!!
Regards,
Daragh.