The problem with putting lacquer over oil based paints is lacquer contains acetone which is too hot of a solvent for oil based paints. Lacquer works by melting into consecutive coats like shellac and when lacquer tries to melt into oil base paint it gets under it and lifts the finish as though you put paint and varnish remover on it. Oil based paints use a mechanical bond where they bond to the surface rather than melting in.
I haven't used a lot of Valspar finishes, mostly because I rarely see them in the store. I did paint a tractor with some of their enamel and you could almost see the color fading daily so I don't care to use anymore Valspar products.
True. Thats also why you have to catalyze each sealer you use under a conversion varnish because the acid in the varnish will melt down into the previous applied finishes and cause adhesion problems and eventually the topcoat will flake off and in some instances, peel the entire finish away from the raw wood.
CAB doesnt contain acetone. Thats why I said in the other thread that acrylics do not rewet each other. Not trying to get too technical here, but CAB acrylics contain:
Lt. Aliphatic Hydrocarbon Solvent, Ethylbenzene,Xylene, Ethanol, Methyl-1-propanol, Methyl Ethyl Ketone, Methyl n-Amyl Ketone, Isobutyl Acetate, and Methoxy-2-Propanol Acetate. All are weaker solvents and will not hurt any oil finish EXCEPT for the MEK, but its not enough in it to amount to much. MEK is only added first to dissolve the Ethylbenzene when making the product.
But, its always best to apply a sealer over an oil base, mainly to allow for more build. It usually takes 2-3 coats of CAB to equal the build of 1 coat of a high build sealer once its dry.