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Uneven suction effects on poor walls may be generally counteracted by the use of varnish type priming coats at the risk of cracking and peeling of later paint coats.
A better looking job is often temporarily secured on non-uniform plaster, through the use of varnish base primers, but the prospect of future failures is always great.
Therefore, painters, architects, chemists and engineers agree that the use of varnish sealing coats is not the proper procedure in the painting of plaster walls.
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