it takes a LOT, and I mean ALOT of red coloring to achieve red when using wilton. If you can, get some Americolor red. doesnt take a whole lot.
careful with the wilton and all the red you will need. alot of times it will break down the icing. alot of people airbrush their cakes to get the true red.
sorry to be the bearer of bad news. 
or get you to a point that you only need to add a small amount of tint. i thought about adding the jello to the frosting i made, and decided not too and used the "let it sit for 3 hours and the red will darken" method
should i just make more and try the jello?
or maybe i should make Dinoco Lightning McQueen, the blue car lol
I had the same exact problem 2 months ago. A double batch took 3 large containers of Wilton gel and some Wilton spray red, but I got it. Not without a price though, the icing tasted bitter and stained everything it came in contact with such as lips and teeth. Next time, I will do it differently.
Can you get Americolor instead? Otherwise, maybe you can use the spray color only. In other words,ice it white and then get a couple cans of the Wilton red spray and spray paint it once you have it smooth and crusted. That goes on red so I think it would be fine.
Red is the absolute worst! I always use Americolor coloring now. Wilton just doesn't work as well. Plus you use a lot less with Americolor. Also, I highly suggest an airbrush machine. I got mine super cheap online. I think it was only around $100. I had to do a dark black cake for my friend's breast cancer benefit and it's almost impossible to get the color really black. The airbrush machine saved me HOURS of kneading fondant 
Good luck!!!!
I was at Michael's the other day, and Duff has a spray on color, I did see a can of red. Good for those of us who don't have an airbrush!
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