Generally most people use ACrylic paints mixed with some form of adhesive.
Acrylic by itself will Chop and Flake off of latex rubber.
Spray some adhesive on the latex, mix some paint/adhesive and begin airbrushing.
Now what I cannot help you with is the adhesive.
Here in the use we use something called PROSAIDE. It is a medical adhesive which is water soluble. I do not know if it is available in the UK or what a comparitive adhesive would be.
Hope this helps.