I recently repainted a wooden panel in the bathroom that had (over some years) developed mildew stains under the hand-towel hook. We still want to keep the hand-towel in the same place, so as a preventive measure I decided to varnish it after painting.
Previously the panel had light white woodstain on it (well actually, diluted emulsion paint), covered with acrylic varnish. Now it has white satin paint for wood on it.
I found a tin of "clear satin outdoor varnish" in the shed & thought "this must be tough stuff". I started slapping some on the panel today --- it was yellowish or light brownish, not clear. So I stopped to see if it cleared on drying. Nope.
Is it likely to be discoloured (well, coloured at all) because it's old? (It looked to be in good condition when I opened it.) Or do I need a particular kind of "really clear" varnish to put on top of white paint?