Ultra-fast UV-cured material for repairing surface imperfections

A method of sealing surface imperfections on a sanded surface repairing a vehicle body comprising:

• flow applying an uncured layer of a formulation consisting of:
• a polyester resin, an optional aliphatic urethane acrylate oligomer or polymer;
• a photoinitiator only activated in response to actinic radiation to induce cure;
• a crosslinking agent, a solvent in which said polyester resin and said crosslinking agent are soluble, and a particulate filler selected from the group consisting of:
• talc, alumina trihydrate, calcium sulfate, calcium carbonate, magnesium sulfate, magnesium carbonate, barium sulfate, and microspheroids, the formulation applied to a sanded cured body filler on the vehicle body, said polyester resin terminally functionalized with allyl glycidyl ether, glycidyl methacrylate, trimethylolpropane diallyl ether, allyl pentaerythritol or polymeric allyl glycidyl ether;
• and said crosslinking agent selected from the group consisting of diallyl fumarate, diallyl diglycol carbonate, allyl methacrylate, isobornyl acrylate, diallyl phthalate, diallyl suberate, diallyl tetrabromophthalate, diethylene glycol diacrylate, diethylene glycol dimethacrylate, diethylene glycol divinyl ether, N,N′-dimethacryloylpiperazine, 2,2-dimethylpropanediol dimethacrylate, dipentaerythritol pentaacrylate, dipropylene glycol dimethacrylate, di-trimethylolpropane tetraacrylate, divinyl glycol, divinyl sebacate, glycerol trimethacrylate, 1,5-hexadiene, 1,6-hexanediol diacrylate, 1,6-hexanediol dimethacrylate, N,N′-methylenebismethacrylamide, 1,9-nonanediol dimethacrylate, pentaerythritol tetraacylate, pentaerythrtol triacrylate, pentaerythritol triallyl ether, 1,5-pentanediol dimethacrylate, poly(propylene glycol) dimethacrylate, tetraethylene glycol dimethacrylate, triethylene glycol diacrylate, triethylene glycol dimethacrylate, dipropylene glycol diacrylate, triethylene glycol divinyl ether, 1,1,1-trimethylolethane trimethacrylate, 1,1,1-trimethylolpropane diallyl ether, 1,1,1-trimethylolpropane triacrylate, 1,1,1-trimethylolpropane trimethacrylate, tripropylene glycol diacrylate, 1,2,4-trivinylcyclohexane, divinyl benzene, bis(2-methacryloxyethyl)phosphate, 2,2-bis(4-methacryloxyphenyl) propane, 1,3-butanediol diacrylate, 1,4-butanediol diacrylate, 1,3-butanediol dimethacrylate, 1,4-butanediol dimethacrylate, 1,4-butanediol divinyl ether, 1,4-cyclohexanediol dimethacrylate, bis[4-(vinyloxy)butyl]isophthalate, bis[4-(vinyloxymethyl)cyclohexylmethyl]glutarate, bis[4-(vinyloxy)butyl]succinate, bis((4-((vinyloxy)methyl)cyclohexyl)methyl)isophthalate, bis(4-(vinyloxy)butyl)terephthalate, bis[[4-[(vinyloxy)methyl]cyclohexyl]methyl]terephthalate, bis[4-(vinyloxy)butyl]adipate bis[4-(vinyloxy)butyl](methylenedi-1,4-phenylene)biscarbamate, bis-[4-(vinyloxy)butyl](4-methyl-1,3-phenylene)biscarbamate, bis[4-(vinyloxy)butyl]1,6-hexanediylbiscarbamate, tris[4-(vinyloxy)butyl]trimellitate or combinations thereof and the uncured formulation having a viscosity of between 2850 and 3570 Centistokes at standard temperature and pressure;
• and
• exposing the uncured layer only to actinic radiation to induce cure of the uncured layer to form a sealing coating.