Add a few drops of warm water and knead well
Add a small amount of vegetable oil and knead until smooth
Wrap the playdough in a damp paper towel for a few minutes
Seal it in an airtight container overnight
Warm it slightly in your hands before kneading
Break it into small pieces and work each piece separately
Mix in a little fresh playdough if it is very dry
Store it in a sealed bag or container when not in use