I'm an amateur wood butcher who has worked with many different woods but I'm new to boating and working with teak. Other boaters warned me about the hassles of preparing teak prior to varnishing. My teak, toerail, trim and louvered doors were a dark gray and I was concerned when it turned almost black while applying part I. My fears of were soon relieved when I applied part II, lightly scrubbed and rinsed with water. The teak went from dark brunette to blond as the accumulated grime floated away. After a few coats of varnish I have beautiful honey colored teak. Hint #1: Buy extra part II. You will use more part II than part I. I would suggest about a 2:1 ratio. Hint #2: Let the product do most of the work, only scrub lightly as the teak is very soft. Hint #3: I used two spray bottles to apply the product which I believe made it not only easier to apply but used less product. Wear adequate protective gear, especially goggles and respirator if you apply with a sprayer. This product is a strong chemical. While the first part that you apply is rather strong it is neutralized when part two is applied. I had a hole in a rubber glove that made things a bit uncomfortable. Overall, easy to use and does a great job.

I restored a teak deck and cabin sides that had 8 years of storage grim and moss growing on it. My boat friends thought it was a goner. Alot of elbow grease but came out like new. I would recommend buying a few quart kits( I used 3 for my 27'Cheoy Lee)then purchase an extra quart or two of the part 2 yellow dilute. You need more than they give you.

I used this product for my outdoor teak furniture and it provided a great preparation for teak oil. It lifts the grain of the wood to allow an even application of stain or oil.