I had three paintings that needed modification (see blog# 32). In the first one I used used Galkyd and chalk. I added a few drops of cobalt dryer to this medium as well as a few drops to each bit of color.
In my second painting I glazed the light parts of the painting using G-gel from Gamblin paints. I added G-gel to my paint as well.
In my third painting I made a putty using walnut alkyd medium made by M. Graham & Company to which I added quite a bit of chalk to thicken it up. In all three cases when I needed white I used a fast drying alkyd titanium white.
The mixture that dried the fastest was the first one, the medium with the cobalt dryer. It dried in one day. This didn’t surprise me as cobalt dryer is a powerful additive. Normally I only use it in extreme cases because it is prone to crack and yellow and has toxicity issues. I might use it occasionally to add to a signature or last-minute preparation for a show. The other two mixtures dried in two days.
So while I try not to make using dryers a habit I do use them in the preparation of some of my putties, especially my mixture of Gamblin G-gel and chalk which I think is a perfectly acceptable, archival addition to my painting methods.