Our guild had a spray starch night. The president bought about 12 different types of spray starch and tested each one for flaking, etc. and talked about her results. Then we set up several ironing stations with fabric scraps and all the members could test any of the spray starches/sizing for themselves. It was a great way to try something before you bought it. I know I have purchased some that I hated and never used.
At the end of the meeting, the cans and bottles of starch used for the demo's were given away as door prizes. The first person whose number was called got to choose which type she wanted and so forth. Of course, Mary Ellen's Best Press went first! It was a lot of fun. I won the bottle of Bounce Spray Starch, which I had never used before, but now love.