I am assuming you are using an American buttercream? If so, I would suggest icing your cake and then attaching neon fondant cut out splashes. They would be neater and give the effect splashed paint. Just a thought!
I did this one recently, Cake is covered cream cheese frosting (with marscapone and whipped cream). I thinned royal icing down with a little water and used a new toothbrush. The icing consistency has to be drizzling off the brush when you dip it. Run your thumb hard down the bristles to get finer spots. Stand a little back and flick your wrist to get a good splash and lines. When I tried to flick it on with a paintbrush it didn't work for me. The toothbrush worked very well.
The only thing is it did "bleed" just a very very little into the frosting. But didn't run or affect the look, and you could only see if if you really looked hard.
p.s. Be very careful on choosing your colours. Some colours mix to make muddy brown etc,
Hope that helps!
Well I made the cake yesterday & was really pleased with the results. I don't know whether the consistency of the icing was wrong but I couldn't get on with using the toothbrush! I ended up using a squeezy icing bottle with a writing nozzle on & literally threw the icing on!
I've tried to upload a pic but it wont let me at the moment so I will try again later.
Thank u all for ur help. Claire x
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