In the March 2017 issue of Woodshop News, I wrote about the efforts of the EPA to eliminate paint and coatings removers that contain methylene chloride or n-methyl pyrrolidone (NMP) from the consumer market.
I doubt there’s any problem in finishing more frustrating than fish eye. The problem usually appears as moonlike craters in the first coat of finish seconds after application, but it can also appear as ridges (sometimes called “crawling”), and it can hold off showing itself until the second or third coat.
Two-hundred-year-old furniture looks different than new furniture, even if the old furniture has been well cared for. The difference is caused, primarily, by color change (due to light and oxidation), wear and dirt accumulation as the furniture has aged.