The Gaia Retarder MAX T-08s is a paint additive that slows down the drying time of paint. By slowing the drying time, there is the effect of a smoother finish when painting with an air brush and suppressing brush unevenness from brush painting.
Since the painted surface becomes smooth, the effect of glossiness also increase.
You can have 5-15% of your mix be the Gaia Retarder.

Please adjust the addition amount according to the season and moisture situation of the room.