So why don't you buy the knife made for knockdown? :blink:
This is the question I ask over and over again in this business. There is an amazing amount of improvisation that goes on all the time.
The last new guy we hired was quite an accomplished all around carpenter. He's always used mud out of the bucket to do texture. He spent 20 minutes talking to me about how much better it is, how we could do it (we use actual texture mix in powder form). After 20 minutes I told him, I'm not opposed to changing anything we do. All I ask is for you to first try the way we work, do it enough so that you can then judge which way is better. He resisted for a few times and then about a month later is a total convert to powdered texture mix now.
Same guy found him using a 12 inch knife to do knock down, showed him the acrylic knock down knife, he resisted.. .same conversation... same result... totally loves it...
Whatever it is, guys in these trades make things so much harder on themselves for whatever reason. Mixing drywall mud with soap, pissing in it, mixing Coca Cola... they have all these wives tales they follow, meanwhile the manufacturers spend millions of dollars and thousands of hours testing and producing product for an exact purpose and guys in our trades think that by adding some setting compound to all purpose they are making the perfect mud. :whistling