Robert,
The DC540 is a good product.
Been purchasing the DC540 Gray Primer form the local NAPA store for $3.78 a can. Last time I purchased a case (12 cans) of the primer for $2.99 a can. That is a savings of $9.48.
It is worth other builders to check out the case price.
T Michael Jennings
Knoxville, TN.