You can use it in different ways, for pattern transfer on a cake, for thining icing, it works great for writing when you add it to icing or you could just add color to it an write with it, you could use it to simulate water on a cake adding blue food coloring, I hope this helps ! 
Thank you, thank you for your reply and answer. Your reply has answered a multitude of questions I had. Only 1 further question I have from your reply - How does the piping gel work for pattern transfering? Would love to know.
Again thank you, really appreciate it 
In addition to the uses suggested above, I use it for stained glass effects. There's an example in my photos.
Right now, I'm using it to emboss designs on chocolate Christmas ornaments. I let it dry a bit and then go over the embossing with liquiified luster dust.
I've also used it to make "bubbles" for a champagne flavored cake (also in my pix).
I keep a tub of the stuff (and a backup) all the time. It as a zillion uses.
Hope this helps.
For pattern transfer:
Print out the image or words you want backwards. Place a sheet of waxed paper (or sheet protector, or any clear smooth non-porus surface) over the image. Pipe the gel using a tiny tip - I use a 1. GENTLY touch to fondant or crusted, smoothed bc cake. Straight down, straight up, and your gel has now left the image right on the cake. Trace the image with bc or ri.
Can also dilute and brush or sponge on fondant for a glossy finish.
I absolutely LOVE the stuff to write with! I buy the tubs and add a little ready made icing in the tubes from the supermarket....about 1/2 then i add a little more of the same color, mix it well and I have all kinds of colors to write with pipe with....all of my black outlines are made with this mix if I'm not using the black edible markers!!
LOVE THE STUFF....in my photos I have a fairy cake that I made the waterfall and lake with blue piping gel. That effect I just added a little blue to the piping gel and left it almost clear..didnt' mix too well so some spots have more color that others...
you will Love using your piping gel! lol
I also want to know about piping gel. I bought some here in New Zealand, white and green in a plastic tube. When I tried to write with it , it wouldn't squeeze out the tip I had attached. I thought it should be clear but coloured if you know what I mean but this just looks like thick icing. It is Wilton's brand.
since one of the main ingredients is corn syrup...you can try that...
then a drop of water as that is another one of the ingredients.
I mix my piping gel with water a lot of times to brush it on for just a shinny look
<---font of useless facts and knowledge!
lol
They forgot to mention that you can use colored piping gel to make stained glass patterns on cakes!
As for Wilton piping gel, it has been mentioned in the threads more than a few times. It is best to warm it in some hot tap water before trying to squeeze it out of the tube. About a minute should be good. It will thin it enough to squeeze it without giving yourself carpal tunnel syndrome.
Theresa 
Zmama..I have things I KNOW how to use, but find no time to use them..lol
same coin, different sides!! lol
Lol. I love how we buy things who don't even know the use for.
I hear you load and clear, I am forever going into my cake supply shop and buying things I haven't got a clue how to use??? The funny thing about is neither do the cake suppliers.........Being creative is all about trial and error....nothing in this world is perfect. The best way to learn is through experimentation. Even if it mean your cake ends up looking like something from a science project! LOL!
Lol. I love how we buy things who don't even know the use for.
I hear you load and clear, I am forever going into my cake supply shop and buying things I haven't got a clue how to use??? The funny thing about is neither do the cake suppliers.........Being creative is all about trial and error....nothing in this world is perfect. The best way to learn is through experimentation. Even if it mean your cake ends up looking like something from a science project! LOL!
That's why I love buying my supplies from BERYLS.COM as a pastry chef herself and English to boot she is an amazing decorator and EVERYTHING she sells she knows what it's for, since she basically uses it herself.
that is how she got into the supply business, she just got tired of people asking her to please get them the tools that she used to create her cakes..lol
I have called her to order just one item, and by the time that I hang up I have bought about 100.00 worth of stuff...and I don't regret ANY of my purchases!!!
Here in Miami there is a place that I buy my wilton products from and they have just NO clue about ANYTHING..you can't even ask them a simple question...it just frustrates me to no end to be standing in line and the person in front of me asks a simple question and they get no help!!
I'm like ..hire people that know what they are talking about for goodness sake.
I end up sticking my nose in ...answering the question..and then getting a crowd of people around me...then I lose my damm turn! lol
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