Polyurethane adhesive

A method of manufacturing a multi-layer panel, the method comprising:

• providing a polyurethane adhesive that is the reaction product of an isocyanate component and an isocyanate reactive component that includes at least one Lewis acid catalyst polymerized polyether polyol having a weight average molecular weight from 200 g/mol to 1,000 g/mol and an average primary hydroxyl group content of at least 30% based on total number of hydroxyl groups, a Lewis acid catalyst for forming the Lewis acid catalyst polymerized polyether polyol having a general formula M(R1)1(R2)1(R3)1(R4)0 or 1, whereas M is boron, aluminum, indium, bismuth or erbium, R1, R2, R3, and R4 are each independent, R1 includes a first fluoro/chloro or fluoroalkyl-substituted phenyl group, R2 includes a second fluoro/chloro or fluoroalkyl-substituted phenyl group, R3 includes a third fluoro/chloro or fluoroalkyl-substituted phenyl group or a first functional group or functional polymer group, optional R4 is a second functional group or functional polymer group.