Occasionally we get an order for an 8 ply mat, but the color the customer wants is only available in 4 ply (I'm talking white and off white rag, not colored mat). I've tried dry mounting two 4-plys together in the heat press with Fusion 4000, but you could see the line where they join on the bevel. Would spray mount be better? I'm thinking I'd have the same issue. Any one have a better solution?