with resinous and or waxy type materials and by the addition of filler type materials the reaction can be facilitated by the use of certain resins which when molten at elevated temperatures act as a compatible solvent wherein the chemical reactants are chain terminated prior to excessive cross linking and resultant thermosetting the basic resinoid can be prepared by adding to a liquid or molten fatty acid preferably in a molten solvating media a quantity of urea which is then heat reacted with formaldehyde thermosetting condensation polymerization is blocked by esterification of the methylol group with the fatty acid as well as by using a formaldehyde to urea mol ratio of from 1 2 to 3 1 and preferably using equimolar ratios of the two for both fixturing and pattern melts a preferred formulation contains the following ingredients while various types of formaldehyde solutions can be used in the preparation of the resinoid of the present invention it has been found most practical to introduce as few volatiles such as water alcohol or the like as possible and to this extent a commercial concentrate such as that known as 34 uf concentrate 85 34 has been found to be most useful this material is a clear colorless slightly viscous liquid composed of 60.