Combine the Carbopol resin mucilage and water using low shear agitation. Add the propylene glycol and methyl paraben and heat to 70 C. Weigh all the ingredients in Part B into a separate vessel and heat to 70 C. Add Part B to Part A using moderate shear agitation. Add Part C using moderate shear agitation. Cool, with stirring, to 40 C. Add Part D, stirring well until room temperature is reached.