All of our gels are made with a high degree of purity. We ONLY use a highly refined white tech grade mineral oil. This combination of ingredients makes our gel very safe to work with.
Gel simply becomes liquid as it rises in temperature.
There is no need to exceed 250 F. Gel will not melt too well, if at all, using the double boiler method. It needs direct heat. Although you can use a pot or heat resistant glass container on the stove, we recommend you purchase something like the Presto Kitchen Kettle 6 quart electric multi-cooker. This unit will melt up to 9lbs of gel. Although there is a temperature setting for this or any other similar unit - it may not be truly accurate.