Spectrafix

However, SpectraFix takes some practice to use because it's applied with a pump misting bottle instead of an aerosol spray can.

It is easy to use too much SpectraFix and leave puddles of liquid that may dissolve passages of color; also it takes a little longer to dry than conventional spray fixatives between light layers.

SpectraFix, a modern casein fixative available premixed in a pump misting bottle or as concentrate to be mixed with alcohol, is not toxic and does not darken or dull pastel colors.