I followed the directions on the pan and my cake seems too thin... Should I use mor ebatter next time? How much do you guys use for a 13x18 (half sheet) ?

Look here
http://www.cakecentral.com/article15-Cake-Baking-Cutting--Serving-Guide---3-in-Deep-Pans.html

I usually fill my pans about 2/3 full. I sometimes have to cut some off the top...but they are never too thin. Hope that helps.
traci

thanks ladies