Thinning TotalBoat Halcyon varnish is not required for the first coat, or any of the subsequent coats, however, Halcyon can be thinned with fresh, clean water (up to 20% maximum) to achieve a desired flow and extend the wet-edge time.
Thinning Halcyon varnish will reduce the glossiness of the material at a proportional rate to the amount of water added. To achieve the highest gloss finish possible, do not thin Halcyon Clear Gloss or Halcyon Amber Gloss.
Do not use any other liquids or solvents to thin Halcyon. If Halcyon is to be thinned, it is strongly recommended to perform a small test sample to ensure that the desired finish is achieved.