I have found that there are many combinations of wood sealers that people use, mix and / or willing to pay for. What is important in the end is that it lasts and does it match the adjacent woodwork. Do some reading on varnishes and try some samples "out of the can" to match the current surface. All varnishes, brushes and techniques are not the same.
Some boaters like glossy, some like mat finishes. Some finishes penetrate into the wood, some are like paint and go on top of the wood. I was in the same position a few years ago on my President. A good scraper and sanding techniques got my boats brightwork beautiful. I now know what is on my wood work and how to touch it up if needed.
Tom and Cheryl
1982 41' President