Clear water-based acrylic floor varnish staining pine floor yellow

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Badger35
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Clear water-based acrylic floor varnish staining pine floor yellow

Post by Badger35 » Tue Oct 20, 2020 12:35 pm

When we moved into our 1980s house five years ago we removed the carpets and varnished the pine floorboards with Ronseal diamond hard clear matt floor varnish. The floor boards were in excellent condition, and required very little prep other than a wipe down.

In one of the rooms, there has been some water damage to the varnish, that we have decided to remove and re-varnish. The old varnish was removed using a solvent for acrylic varnish (containing acetone) and some vigorous sanding of increasing grit to get a varnish-free, smooth, perfect finish to re-varnish. The boards were a nice pale pine colour, not too dissimilar to the unvarnished area....before we applied some new varnish.

We have used exactly the same varnish as the rest of the floor; however, the varnish has turned the area of floor a tan/tea-stained/yellow sort of colour which is quite a lot 'darker' and does not match the rest of the floor in that room or rest of the house.

This happened after just one coat, that we sanded off (thinking that would help), before trying again. The same thing happened again.

Does anyone know what is going on please? This is a water-based varnish, i.e., there is no oil in it, so that is not the problem.

Many thanks in advance.

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