I have used the Mercury/Quicksilver outboard 'Power Tune' spray and it works well. However I also use the 'Patch Out' liquid by wipe-out and that works well too - so well that I haven't tried their carb-out product.aJR said:I found another that is IMO the same stuff ,it's Engine Tuner sold by EVINRUDE/JOHNSON the outboard guys..If it is not the same it still works the same and that's all that matters..