djs
"(which is actually the lamination resin)"
It is similar, but the resin in the plies is not the same as the finish coat. It is glued up into large sheets and then cut down and "turned" into blanks/stocks.
The finish is a sprayed, catalized resin that will bond to the resin in place, but is virtually impossible to get anything else to bond well to it, even another coat of the same stuff. If they were the same the bonding issue would not be there... Machining the stocks shows a differenece in heat tolerance between the resin and the finish. The finish melts and screws with the cutters.
art
