I have had my T37 for 23 years. Every 5-7 years I take it down to bare wood. Gently. I use a heat gun (practice this off the boat if you have not used one with paint--it is possible to burn the teak) you just want the old finish to start to bubble and then scrape it. Keep the gun moving all the time. If you get tired, stop. You need a high quality scraper for the purpose--not just a paint scraper and you need to be careful not to gouge the wood as you scrape. I then sand it smooth and start out varnishing with 50/50 Epiphanes and thinner (I use nothing but the no sanding type--but remember that this version must be thoroughly stirred each time you use it) for the first couple coats. I do something like 5-8 coats with only the last one or two being full strength. Then I lightly sand and do one quick coat at the beginning of each season and that seems to work for another several years. The key to beautiful varnish is cleanliness. You need to vacuum and wipe down everything with the specialty tack rags and then remember not to wear the same clothes to sand and to varnish. Don't varnish after 3pm or in windy or dusty conditions. There are some good books on varnishing, but some of this comes from working with some folks who do it for a living here in Maine. I have used bristle brushes, but find that I get just as good results with good quality foam brushes from the marine folks, not the cheap ones from Home Depot or Harbor Freight. If you are familiar with roll and tip in paint process, the same process can be used on applying varnish and that is the way the folks at Hinckley do it. It is personal preference, but I dislike Cetol. It is gooey and difficult to keep clean and I do not like the looks of the stuff. It took a while to get the hang of varnishing, but I actually like to do it. But I am retired and have the time. By the way a battery powered multi tool is a huge help in sanding some places if you use it sparingly, but the folks at Hinckley do it all by hand--you will see ten folks descend on a boat and have all the brightwork sanded in a very short time. If you get a quality base on, the annual light sanding can be done in a couple hours and the varnishing in about the same time.
FWIW
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