i think need to revise my comment on the stainless still mix stir. I was operating it at too low of rpms. My drill had a second gear i had not noticed. I was using 0-450 setting vs 0-1500 rpm setting. So i did an expirment today. I used the low settting and had very little if any bubbles. Then i pulsed it a few times in each direction at 1500. Oops, I had a volcano of foam. Twice. Fortunately this kit had a F-pack that made up for what i spilled.