While becoming an expert installer means cash money in today’s sign market, there are some substrates that the most elite vinyl pros even stay away from — and for good reason. Despite the temptation of extra income, attempting to apply to substrates that are not clean, smooth or non-porous is an ultimate waste of time...
http://supply55.com/blog/2013/07/what-substrates-can-i-apply-vinyl-graphics-to/
