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Langridge Retouch Varnish is made by dissolving Paraloid B67 resin in Artists’ White Spirit to make a liquid. Brush or spray applied over paintings, the solvent will evaporate, leaving a thin, even coat of the resin. Langridge Retouch Varnish may be applied to touch dry oil paintings.Artists’ oil colours dry by absorbing oxygen. For full drying this process generally takes between 3-6 months although it can take longer with extremely thick paint films (5mm or thicker). When a painting has a dry surface film (touch dry) it may be protected with the application of a temporary varnish that will allow the passage of oxygen to the oil paint and continue the successful full drying of the painting. A final picture varnish applied before the 3-6 month drying period will prevent thorough oxygen absorption leading to potential oil paint film failure due to erratic drying.