Foam based wood stains

 
Wood stains are low viscous liquids, designed to penetrate in wood to deliver functional barrier protection and esthetics. The application of wood stains is usually cumbersome, brush application suffers from dripping and sagging whilst spray application causes overspray. WB wood stains require many hydrophilic additives to manage the application in the liquid stage. But these additive are detrimental to the barrier properties of the dried stain. This paper presents a novel approach to limit the use of these detrimental additives and improve the application properties at the same time. Instead of adding thickeners and defoamers, we make use of air to temporarily thicken the woodstain. The aerated woodstain has the consistency of a foam which has much improved application properties over a standard liquid. Careful tuning is required to ensure the foam is stable enough to deliver application benefits but unstable enough to not leave any traces behind after drying.