Types of Polyurethane Finish - An Overview
Nitro finishes, even so, crack and yellow with age, and they might “check” (guitar-discuss for fine hairline cracks) with age or unexpected publicity to very low temperatures. They get thinner and much more brittle as they age as the thinners in them continue on to evaporate in the course of an instrument’s life time.Toxicity: H2o-based polyu