I know the crackle of which you speak. I have had it on areas where the POR-15 was a little thicker, and had not set far enough yet. As a result I often will wait almost too long on the setting of the POR-15.
I find, in general, 6 hours from application of the POR-15 until I spray the top coat on. I use Xylene as the thinner on my top coat when spraying, and I have successfully used it to thin the POR-15 as well the odd time when I spray it. So I suspect the xylene may be the binder when the top coat is applied over the POR-15.
I did the wood spokes with brushed on POR-15 and sprayed on the Gillespie top coat 6 hours later. Worked perfectly.
Again, I'll wait for the specialist's recommendation prior to going any further on the wood. More to follow in that regard. Tomorrow I'll take the left sideboards off, and I have to level off one of the support brackets. I'll add some more shots at that stage.
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