An urea-aldehyde resin, highly resistant to ageing and similar optical properties to most natural resins. A low viscosity resin with great self-levelling properties making it ideal as a varnish. Insoluble in water, soluble in high and medium polarity solvents - alcohol and white spirit. By increasing the percentage of white spirt, this will increase the working time but by increasing the alcohol content, this will give you a cleaner finish but decreased working time.