Polyurea compositions and methods of use

A composition comprising:

• a polyformal-isocyanate prepolymer comprising the reaction products of reactants comprising a polyformal polyol and a first diisocyanate;
• and
• a polythioether-isocyanate prepolymer comprising the reaction products of a polythioether polyol and a second diisocyanate;
• wherein the polyformal polyol comprises a polyformal polyol having the structure of Formula (18):
• wherein w is selected from an integer from 2 to 50;
• and each R3 is ethane-1,2-diyl;
• wherein the polythioether polyol comprises the reaction product of reactants comprising a hydroxy vinyl ether and a thiol-terminated polythioether selected from a thiol-terminated polythioether adduct of Formula (15a), a thiol-terminated polythioether adduct of Formula (15b), and a combination thereof:
• HS—R1—[—S—(CH2)p—O—(R2—O)m—(CH2)2—S—R1—]n—SH (15a)
• {HS—R1—[—S—(CH2)p—O—(R2—O)m—(CH2)2—S—R1—]n—S—V′—}zB (15b)
• wherein,
• each R1 independently is selected from C2-10 alkanediyl, C6-8 cycloalkanediyl, C6-14 alkanecycloalkanediyl, C5-8 heterocycloalkanediyl, and —[(—CHR3—)s—X—]q—(—CHR3—)r—, wherein,
• s is an integer from 2 to 6;
• q is an integer from 1 to 5;
• r is an integer from 2 to 10;
• each R3 is independently selected from hydrogen and methyl;
• and
• each X is independently selected from —O—, —S—, and —NR—, wherein R is selected from hydrogen and methyl;
• each R2 is independently selected from C1-10 alkanediyl, C6-8 cycloalkanediyl, C6-14 alkanecycloalkanediyl, and —[(—CHR3—)s—X—]q—(—CHR3—)r—, wherein s, q, r, R3, and X are as defined as for R1;
• m is an integer from 0 to 50;
• n is an integer from 1 to 60;
• p is an integer from 2 to 6;
• and
• wherein the first diisocyanate and the second diisocyanate are selected from 4,4′-methylene dicyclohexyl diisocyanate.