This goes on well, spreads well, goes far and leaves a great (waterproof) finish. My old decking was in serious decline. It was green, wet all the time and murderously slippy underfoot. Some of the timbers were heading for replacement. I applied firstly a product to kill all the algae, moulds, fungus and moss. Then I brushed the worst of the debris off, replaced parts that had gone too far and applied wood hardener and filler to areas that were still salvageable. I then power-sanded the whole lot, to get back to really decent wood and open up the grain. I then applied timber preservative that soaks deep into the wood and keeps working over a long time (2 or 3 years) to keep the algae from coming back. When the timbers were again fully dry, I gave it a final light sand all over, then a good stiff brush and applied 2 coats of decking oil in Neutral Oak. The first coat soaks in and straight away you can see the grain of the wood. Once really dry, the second coat is more easily applied and you don’t need so much as it doesn’t soak in as much as the first coat. The 2 coats leave a really nice finish and the rain just beads and runs off. It’s no longer slippy underfoot and looks great. It will need doing with this each year and then a more significant overhaul probably every 2 or 3 years. Much cheaper than replacing it with new decking. Pleased with the result. Also, it’s easy to clean the brush in warm soapy water. No need for powerful solvents.