I was thinking for a craft outbuilding the sealing aspect to keep out guests.  That was just a coating to seal and the R is per inch.  Did my Dads house with seal coat then fiberglass and it has worked well.  My house is 2x6 studs and 5.5 of foam for  R 38.5 with R 66.5 roof.   
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                                   Posted by: david bailey <hapennyherald@yahoo.com>
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