Dan, if you haven't waxed in awhile the color will be somewhat yellower than it was when you started. The reason is that the white gel coat oxidizes and gets a chalky white color, and the wax gets rid of that and lets the color underneath shine through. Your boat has a bit whiter gel coat than my 1980, which is a lot more pronounced in terms of the yellowy color that comes out after polishing/waxing...