The vinyl is the kind from Happs, so it's used in the application of these things. In terms of the heat, it's hot in our garage. With the summer months and the temp from the garage it's probably around 115 degrees. I'm guessing that's the problem but I'm not sure. I'm applying it to MDF which I had painted before. I took a rag and got as much of the dust off as I could so I don't think it was a result of a dirty surface.
I was hoping to get this completed before the end of the month, when I'm moving, but if the heat is the cause I might have to wait longer, when I can move it into the house.