With both the linseed oil and the galkyd you are probably using too high a percentage of medium to paint and ..."alligator skin" is the result. You might want to try either the galkyd gell( in a tube) or a classic mixture of 1/2 turpentine(not mineral spirits it doesn't dissolve damar varnish very well) 1/4 linseed oil and 1/4 damar varnish.
Another explanation is that the surface on which you are applying the glaze is to slick. Apply a very thin layer of damar retouch varnish let it dry and then use the "classic" glazing medium. Good luck. Bill |