I just made that size last week. I used the bake even strips from Wilton and it worked great!
I bake this cake all the time too and baked one today. I also use the bake even strips ( I use 2 and pin them together so they will go around) and I use 2 upside flower nails in this cake. Works great. I do lots and lots of sheet cakes. Sandy
I always say it will serve 54, if I use the marker that marks each piece it will make 54 1 inch pieces. Sandy
Okay, I decided I am going to make a second layer tonight...it will be easier to fill it anyway...I won't have to try cutting such large pieces
One more question....last night, when I took it out of the pan, some pieces stuck to the pan...how long do you guys wait until you take it out? I think I waited about 15 minutes. Also, I used Wilton Cake release and a little flour on the bottom.
I always use parchment paper for the bottom of the pans. I do at times have a problem with the sides sticking. I use the Wilton cake release but still have the problem. I also use Wilton pans if that makes a difference. Does anyone have suggestions for keeping the sides from sticking?
Not to hijack the thread but I would like to know what everyone considers a 1/4 sheet, a half sheet and a whole sheet and how many a one layer serves of each. I thought I knew but have gotten conflicting info. Thanks!
See this thread for some good explanation on this topic: http://forum.cakecentral.com/cake-decorating-ftopict-628706-18x24.html
Based on 2x2x2" industry standard servings, a 11x15 serves 35 (5 rows x 7 columns) and a 12x18 serves 54 (6 rows by 9 columns). (sheets are easy to figure, you just have to do the math).
Stephi!.... I never tried the parchement on the sides. Not sure how you would keep in place. Has anyone else tried this? As far as trimming the cake.... IndyDebbie wrote about that. I would say the trimming is leveling the cake while still in the pan so the it is even all the way across.
I always just spray the sides of my pans with the flour/grease spray then put either parchment paper or wax paper in the bottom of all my pans. I never had any problems with my cakes not coming out clean. I do let them sit about 5 or more minutes to cool, the rule used to be in 4-H just until the sides pull away from the pan its ready to come out. In my world I have 3 sizes of sheet cakes, sm, med and lg. which are 9x13, 11x15 and 12x18 these are the only sheet cake pans I seem to need. Sandy
If you need any help with your sheet cakes just pm me, Ill try and help.
Yes the upside flower nail does work great and when I do the bigger sheet cakes I use 2 in mine. At least you are getting double duty out of the flower nails...ha!
The reason Iv switched from parchment paper in the bottoms of my pans to wax paper is because of cost. The left over wax paper that I trim off goes into my little squares I keep cut to make flowers.
If you let your cake sit out for a few minute ( 5 or so) the sides of your cake should pull away from your pan if its done. Im thinking about trying baking a cake without spraying the sides and see if that works. I do not spray the bottoms if I put in the paper, I found that sometimes that kept the paper from coming out well. Sandy
The reason Iv switched from parchment paper in the bottoms of my pans to wax paper is because of cost. The left over wax paper that I trim off goes into my little squares I keep cut to make flowers.
Doesn't the wax melt into the cake?
You know Iv been ask that before on here and it doesn't. My mom used it on all her cakes when I was a child ( longer than I want to remember-ha!) and it always worked then. Sandy
Thanks for the info...something new to consider
The reason Iv switched from parchment paper in the bottoms of my pans to wax paper is because of cost. The left over wax paper that I trim off goes into my little squares I keep cut to make flowers.
Doesn't the wax melt into the cake?
I know I accidentally used wax instead of parchment on a batch of cookies once, and had to throw them all out because of the melted wax factor.
And you can trim parchment into little squares for flowers, too. 
I know that when I made candy clay, the directions I followed said to use wax paper...the heat from the clay melted the wax and I spent forever shaving off the outside layers of wax away from the clay blob so I didn't waste the whole thing!
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