Thank you all for your suggestions and replies. I did call Dicor and asked for their answer...naturally it was to use their product. To make the small bonding that I required, which was approximately 36" long by 18" wide, I didn't want to purchase a gallon of their adhesive. It wasn't the cost as much as that the remainder, would in all probability, go to waste. What I did do was research all of 3M's spray on adhesives and came up with a winner....that being 3M 90. It worked out perfectly for my "fleece backed TPO", by spraying it on both the fleece and the OSB. I let it set up for about 2 minutes until tacky before bonding the surfaces together and then rolling it with a rolling pin. It came out great.