I USED ACRYLIC retarding gel as an "oiling up" medium in the studio with great success. So I wanted to try it in the field.The results were similar even though the heat and wind did cause the gel to dry quicker. It still worked very well and I can easily see that a very sophisticated plein air technique could evolve from this method of painting. One word of caution though, be sure to varnish the finished painting with a thick application of acrylic varnish. Otherwise the layers won't properly cross link and you may have problems with de-lamination (the layers won't properly adhere to each other).