Cake postcard tutorial

by SheKnows
Jul 12, 2012 at 3:01 p.m. ET
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.

1 /21: Proof: Mailed cake postcard

1/21 :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.

2 /21: Postcard side of cake

2/21 :Postcard side of cake

Use this cake postcard to send birthday wishes to someone special or maybe even as a birthday party invitation.

3 /21: Close-up of icing

3/21 :Close-up of icing

Even the icing on the cake postcard looks good enough to eat!

4 /21: Variety of cake and icing options

4/21 :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.

5 /21: Good enough to eat

5/21 :Good enough to eat

Doesn't that look tasty? Ready to make your own cake postcard? Let's go!

6 /21: Gather the supplies

6/21 :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.

7 /21: Cut the sponge

7/21 :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. 

8 /21: Cut a center groove in the sponge

8/21 :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.

9 /21: Paint the sponge

9/21 :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.)

10 /21: Trace around the shape

10/21 :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.

11 /21: Attach the postcard

11/21 :Attach the postcard

Spray glue the postcards to the solid, flat sides of the sponge cake wedges.

12 /21: Add caulk to piping bag

12/21 :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.

13 /21: Pipe the center groove

13/21 :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.

14 /21: Pipe the top of the cake

14/21 :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.

15 /21: Swirl the caulk with paintbrush

15/21 :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.

16 /21: Allow to dry

16/21 :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.

17 /21: Write your message

17/21 :Write your message

Write your message on the postcard side, leaving enough room for an address and postage. Sizes, shapes and weight of each cake postcard will vary, but most of mine required three, $1.00 stamps. 

18 /21: Strawberry cake postcard

18/21 :Strawberry cake postcard

Paint your sponge pink for a strawberry cake.

19 /21: White cake postcard

19/21 :White cake postcard

Use white caulking instead of brown for vanilla icing.

20 /21: Yellow cake postcard

20/21 :Yellow cake postcard

Or paint your sponge yellow for a classic cake look.

21 /21: Cake postcard color options

21/21 :Cake postcard color options

You can also mix it up by using different colors of paper for the postcard. Let your creativity run wild!