The paint used at this time was probably an oil-based, heavily leaded, coach enamel. This was applied by brush and naturally air dried, to a semi-matt finish. It required coating with varnish to produce a gloss finish, (which was obviously not necessary for camouflaged vehicles.) The biggest problem with it, was the long drying time, which limited painting to one coat per day maximum in good conditions. This could be improved on unfavourable, cold or wet days, by the addition of Terebin driers. Brushing Cellulose was available pre-war, for the high quality jobs, but Cellulose did not really take off until the adoption of spray techniques in the 1920's.Also, Nitro Cellulose was required for other purposes during the war.