From a post that Graham Naisbitt:


As an example, a silicone conformal coating will wet just about anything,
but it does not adhere well to a PCB surface. ***It may pass a cross hatch
test,**** but only because the tape won't stick to it either! Silicone coatings
are often flexible enough to induce only very low stresses from TCE mismatch
throughout the life of the board, and the low adhesion therefore doesn't
manifest itself as delamination.


                  How do you do the cross hatch test and what type of tape do you use? I am trying to test out acrylic adhesion on LPI(Taiyo) and dry(dupont) solder mask. 
              Appreciate you reply,
                  Ramon

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