This is the one I am using at the moment,; any good garden centre/online supplier should have an equivalent.
As I expect you have discovered, Neem is thick and even wax-like at low temperatures, and thins a lot as it is warmed up. I putt the Neem oil in the microwave to warm it and thin it before mixing with water and the wetting agent, and then shake the mixture vigorously. On cold days, when I am going to the greenhouse, I put the whole bottle/sprayer of mixture in the microwave to warm it up before I go. You want to be quite sure that it is finely mixed when you use it. Leave it in a cold place and you will find a rim of the oil on the bottle, and then you would be spraying water alone....
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