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Cake postcard tutorial

#1/22: Mailable cake postcard
#1/22: Mailable cake postcard
Make a mailable slice of cake! This 3D cake postcard is 100% mailable. The postage is around $3 per slice but the reaction from the recipient is priceless.
#2/22: Proof: Mailed cake postcard
#2/22: Proof: Mailed cake postcard
Proof that you can mail a piece of cake. This slice was delivered to the SheKnows office via regular US mail.
#3/22: Postcard side of cake
#3/22: Postcard side of cake
Use this cake postcard to send birthday wishes to someone special or maybe even as a birthday party invitation.
#4/22: Close-up of icing
#4/22: Close-up of icing
Even the icing on the cake postcard looks good enough to eat!
#5/22: Variety of cake and icing options
#5/22: Variety of cake and icing options
You can make different kinds of cake by mixing up the colors of supplies you use to create the postcard.
#6/22: Good enough to eat
#6/22: Good enough to eat
Doesn't that look tasty? Ready to make your own cake postcard? Let's go!
#7/22: Gather the supplies
#7/22: Gather the supplies
These supplies will make 2 cake postcards: 1 large sponge, serrated knife, X-Acto or utility knife, spray paint, 1 tube acrylic latex caulk, spray adhesive, scrapbook paper.
#8/22: Cut the sponge
#8/22: Cut the sponge
With a serrated knife and using a sawing motion, cut a sponge in to two, cake wedge shapes to make the postcard. Large sponges can be found at hardware stores and in the automotive departments of most big discount stores. 
#9/22: Cut a center groove in the sponge
#9/22: Cut a center groove in the sponge
Using an X-Acto or utility knife, cut a section of foam from the center of the sponge. It's doesn't have to be perfect. Just cut a wedge big enough so that you can add a line of caulking there later.
#10/22: Paint the sponge
#10/22: Paint the sponge
Paint sponge wedges with desired color. (Brown looks the most realistic, but pink and yellow are fun too. White was probably my least favorite.)
#11/22: Trace around the shape
#11/22: Trace around the shape
When the sponge wedges are dry, trace around them on a piece of cardboard, kraft paper or colorful scrapbook paper. This will be the postcard side. Heavier paper works better and will give you a sturdier wedge of cake for mailing. Cut the postcard shapes from the paper.
#12/22: Attach the postcard
#12/22: Attach the postcard
Spray glue the postcards to the solid, flat sides of the sponge cake wedges.
#13/22: Add caulk to piping bag
#13/22: Add caulk to piping bag
Using a caulking gun and your desired caulk, fill a plastic disposable piping bag with half of the caulk. This should be enough to do one cake wedge. I was able to pipe two cake postcards with one tube of caulk, but I recommend putting only half of the caulk in the bag at a time. Also, I tried decorating my cake wedges using the caulking gun but it was nearly impossible to control.
#14/22: Pipe the center groove
#14/22: Pipe the center groove
Pipe a line of caulk down the center of the cake wedge, where you removed the sponge with your X-Acto or utility knife.
#15/22: Pipe the top of the cake
#15/22: Pipe the top of the cake
Pipe dollops and swirls of caulking on the top and sides of the sponge wedge just like you're decorating a cake. Pipe along the edge of the cake postcard to form a seal between it and the sponge.
#16/22: Swirl the caulk with paintbrush
#16/22: Swirl the caulk with paintbrush
If needed, use a small paint brush or toothpick to swirl and adjust the thickness of the caulk on the cake top and side.
#17/22: Allow to dry
#17/22: Allow to dry
Allow your cake postcards to dry for 3-5 days. I placed mine on sheet of parchment paper and lifted them up periodically so that the caulk wouldn't dry and adhere to the paper.
#19/22: Strawberry cake postcard
#19/22: Strawberry cake postcard
Paint your sponge pink for a strawberry cake.
#21/22: Yellow cake postcard
#21/22: Yellow cake postcard
Or paint your sponge yellow for a classic cake look.
#22/22: Cake postcard color options
#22/22: Cake postcard color options
You can also mix it up by using different colors of paper for the postcard. Let your creativity run wild!
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