You maybe squeezing too much water out the end of your brush.
I like to to have my brush just damp and then pick up colour from the pot, the less water the darker the colour, more water lighter the colour.
You can also spritz water into your pot let it sit for a minute then pick up colour with your brush (water barrell or a paint brush) I finds this works well but remember to let the post dry before closing the lid.
Hope you fins the method that suits you.
Maz
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