Start with muffin tin, food coloring and foam shave cream:
Spray some foam in each tin:
Drop some food coloring – mix your primary colors to get more colors:
We have a floating mat in the tub which I set this on, but you could rest it or hold it:
Voilah, painting fun!
This washes off with no problem and my boys had a blast! Perfect for all that shaving cream or food coloring you have left over. Also, make sure you use shave foam and not gel – cheaper the better. (Even Olivia in there!)
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Contest Closed 
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Contest Closed 
That is awesome Im going to try that!
That is ingenious I tell you! Who would have ever thought to create bathtub paint!?
I kind of want to try some of that. LOL
You definitely could make an adult version
Love this idea !!