Apply Varnish after the bottle gets completely dry, so that the colour won't drain in water. (Suggestion ~ Use Asian Paint Clear Synthetic Varnish..you can buy it from any hardware shop)
It depends upon the colour layer...if it's a thick layer it can take 45 mins around n if it's a thin layer it can also dry in 15 mins approx!I would suggest you to use hairdryer to dry the colour faster!
Wowww beautiful..Mam just a request if u can make a video on umbrella painting..Warli..and how to fix the colour on it..so that v can use the umbrella in monsoon..thank u
