Are you sure your boat has the original paint? And if so, it hasn't faded ate all in 25 years? Many industrial / automotive paint suppliers, such as the national Finishmasters chain, will come out with a "camera" and then make up an Imron blend that will match what is actually on there. I learned this the hard way, then the easy way. I can show you a spot on my boat done with 6997x/u that sticks out to the most casual viewer. There are spots on the boat where you will not notice they have been done unless I point you to it.