I had no grinder or flap wheel. The Company I went to in order to get qualified had the coupons made up and only allowed me to use a wire wheel. I cleaned the coupon with the wire wheel the best I could before I started. I know how to prep metal when I put it together at work.

I guess it is time to practice my horizontal and do that next.
I do mostly TIG at work and rarely stick. Only if the material is thicker than 3/8" or if it is rusty and covered with ink and mill scale will I break out the rods.