Q #1 Are there any advantages to oil primers over acrylic dispersion ones for creating the best adhesion to the paint layer on a rigid support?
The oil primer, I suspect, would create both a mechanical and chemical adhesion to the paint layer, whereas the acrylic dispersion primer would create only a mechanical one…or is the mechanical adhesion great enough that it would easily suffice on a rigid panel?
Q #2 If using oil primers on rigid panels, would the primer need to cure for several months to a year before using?
Information in your “Resource” section suggested that the dried primer merely needed to resist the fingernail before using.
Thanks for your thoughts.
Hi
There are a number of factors that contribute to proper adhesion of the oil paint layer to the ground (which I believe is your question; correct me if you mean the adhesion of the primer to the support). The degree of tooth (mechanical) plays a major, and probably the central role in good adhesion. Oil paint will adhere to either type of ground if they are properly formulated and applied. On rigid panels where movement and flexibility are somewhat less of an issue as compared to canvas supports, I would think the choice would be aesthetic rather than structural.
The fingernail test is one that shows when it is possible to apply paint, not necessarily when it is optimal. I default to the older maxim that it is best to wait 6 months before painting on an oil ground. Alkyd and faster drying grounds would be optimally ready far quicker. We really need more conclusive testing (if this has been performed, I am unaware of it) before I am willing to say that there is no benefit to waiting for oil grounds to cure.
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