Identifying Nitrocellulose Lacquer vs Polyurethane Finish on Gibson Custom Shop Les Paul
Understanding whether your Gibson Custom Shop Les Paul is finished with nitrocellulose lacquer or polyurethane can be a crucial factor in preserving the guitar's value and ensuring it meets your preferences. Below, we explore various methods you can use to determine the type of finish on your instrument.
Visual Inspection
Visual inspection is one of the first methods you can use to determine the type of finish on your Gibson Custom Shop Les Paul.
Gloss and Depth
Nitro finishes are known for their deeper, more organic gloss compared to the more plastic-like sheen of polyurethane finishes. Additionally, nitrocellulose coatings can develop a natural patina over time, enhancing their depth and aesthetic appeal.
Orange Peel Effect
Nitro finishes may exhibit a slight orange peel texture on older guitars, which is absent in polyurethane finishes that tend to be smoother and more uniform.
Touch and Feel
The tactile experience of the finish is another effective way to determine the type of lacquer used.
Softness
Nitrocellulose finishes are generally softer and more susceptible to scratches and dents compared to the tougher polyurethane finishes. If you press your fingernail against the finish and it leaves a mark, it is likely nitrocellulose.
Warmth
Nitro finishes can feel warmer to the touch than polyurethane finishes, which tend to feel colder.
Smell
The distinct solvent-like smell of nitrocellulose lacquer, especially when freshly applied, can be another indicator. Polyurethane finishes have a less pronounced odor.
Testing with Solvents
Using solvents can be a more definitive method to determine the finish type.
Lacquer Thinner Test
Applying a small amount of lacquer thinner with a cotton swab to a safe area on the guitar, such as the back or inside the control cavity, can help. If the finish reacts and becomes soft or sticky, it is likely nitrocellulose. Polyurethane finishes will not react in the same way.
Acetone Test
Acetone is another solvent that can be used for testing. It will dissolve nitrocellulose finishes but will not affect polyurethane.
Manufacturer Specifications
Reviewing the original specifications or documentation from Gibson can provide crucial information.
Documentation
Check the original specifications or documentation for details on the guitar's finish type. Gibson often specifies the type of finish used in their guitars.
Serial Number Research
Researching the serial number can sometimes provide insights into the manufacturing year and the finish type.
Consulting Experts
If you are still unsure, consulting with a guitar technician or an expert in vintage guitars is advisable. They can provide a more definitive identification based on their experience and knowledge.
By using these methods, you can effectively determine whether your Gibson Custom Shop Les Paul is finished with nitrocellulose lacquer or polyurethane, ensuring proper care and preservation of your instrument.