50.01 wt % of an oligomer prepared by reaction of: 45.78 wt % of polypropylene glycol, MW=4200, 0.01 wt % of acrylic acid, 99%, 0.04 wt % of 2,6 di tert butyl 4 methylphenol, 2.92 wt % of monomeric toluene diisocyanate, and {HEAD ~ 1.24 wt %} of {TAIL ~ 2 hydroxyethyl acrylate} 
50.01 wt % of an oligomer prepared by reaction of : 45.78 wt % of polypropylene glycol , MW=4200 , 0.01 wt % of acrylic acid , 99 % , 0.04 wt % of 2,6 di tert butyl 4 methylphenol , 2.92 wt % of monomeric toluene diisocyanate , and { HEAD ~ 1.24 wt % } of { TAIL ~ 2 hydroxyethyl acrylate }
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