The Humbrol Youtube channel video on using DecalFix recommends it is diluted when applying to surfaces coated in Humbrol Clear (as both are ammonia based), but does not suggest how much it should be diluted. I am currently finishing an Airfix Tucano, which has decals to be applied to the canopy. I have dipped the transparency in Humbrol Clear and want to avoid any problems with DecalFix affecting the superb canopy finish. Can anyone recommend how much I should dilute the DecalFix? Many thanks!