By coincidence, I have just made up a 1% solution (for the 1st time) for making FX37. Boiled 500ml of distilled water in the microwave. Added it to 500ml at room temp in a jug, added 10g of benzotriazole, stirred for about 2 minutes and all went into solution. Odd looking bubbles came up, looking like a clear oil, but they soon disappeared too...
Cheers, Bob.
Cheers, Bob.