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Havoc88:

Red oak has a lot of tannins in it which give it much of it's distinctive colour. These tannins are soluble in water, so they'll often bleed through a latex primer. Tannins aren't soluble in mineral spirits or alchohol, so an alkyd primer or BIN Shellac primer would probably have prevented that discolouration from happening.

That discolouration MIGHT also have been caused by incompatability between the two paints that were mixed. Generally, though, if incompatability causes a problem in paint, the result is usually something called "flashing" where the gloss of the paint varies substantially from one place to the next.
 
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