Sometimes it is necessary for painters to “thin down” paint to make it easier to apply - this may be necessary due to hot weather, or because the paint you are applying is not “flowing” onto a particular surface.
Paint manufacturers generally do not recommend thinning of paints, and you need to ask for specialist advice if you think it may be necessary to do.
Products are available to do such a thing:
*Both these products need to be used carefully. No more than approximately 10% to 15% of either product can be added at one time, and it is recommended to ask for help in store before simply trialing this procedure.