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DryDex Premium Lightweight Joint Compound. This product is designed and intended for use in the finishing of gypsum panel joints, nail heads and metal corner beads (thin "skim coating" applications). DryDex Premium Lightweight Joint Compound is a water based formula, as such, the sole drying mechanism is the evaporation of water. Dry time can be significantly impacted by cool or humid application conditions, moisture in the application surfaces or by thick (deep) applications of the product. For deep fill applications or applications where faster set times are needed, we would recommend the use of ready to mix (dry powder) products such as FASTPATCH 30 Patching Compound Powder.