Dating fender necks
For example, there is a picture in Tom Wheeler's American Guitars, page 54 (upper left corner), of a man with long rubber gloves dipping bodies into a tank at Fender in the late 1950's.The description incorrectly denotes the man is applying "Fullerplast" to the bodies.The sealer allowed any color coat (be it sunburst or a custom color) to not soak into the wood.Since the sealer is essentially a clear inexpensive primer, less color would be needed (and color costs a lot more money than a cheap sealer).That's why 1954 to mid-1956 Fender Ash body Strat sunburst's yellow looks "brighter" than later Alder yellow stained Sunburst finishes. Not only was the yellow sprayed, but the Ash body also had to be "pore filled" (sealed) before spraying the Sunburst.
Even though alder is a "closed pore" wood, the first few coats of lacquer will soak in like a sponge without some type of sealer coat.
This occurs when the finish dries and sinks into the open pores of the wood, leaving a finish with many dimples.
To stop this, a pore filler consisting of fine sand mixed in a thick solution is brushed (or sprayed) on the bare wood.
Fullerplast dries in 15 minutes, and is paintable in one hour. Most experts agree the actual product "Fullerplast" (as made by Fuller O'Brien) actually started to be used around 1963 at Fender.
Prior to that, Fender used other products as their sealer coat, but they did the same thing.
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Another misconception about Fullerplast is it's color.