Hey, I know 303 is good stuff.... but will it alter the color of the top any?

I know - odd question - but my top has been garaged for four years and looks factory new to this day (a testimony to the guy who owned the car for four years). So, what will it look like after the 303 is on there - I KNOW the top will resist the water better, but will it change the color? Will it change the texture or anything?