Coating compositions and methods for using the same as a spot blender

1. A composition comprising:

2 to 10% of a polymeric polyol;

1 to 5% of a urethane (meth)acrylate containing both isocyanate groups and hydroxyl groups;

less than 0.1% by weight of a photoinitiator; and

90 to 97% of solvent; the percentages being by weight and based on total weight of the composition.

2. The composition of claim 1 , wherein the composition comprises ≦0.07% by weight of the photoinitiator.

3. The composition of claim 1 , wherein the polymeric polyol comprises a (meth)acrylic polyol.

4. A coating system, comprising:

a clearcoat, wherein the clearcoat comprises a polymer having (meth)acrylate unsaturation, a polyisocyanate and optionally a polythiol; and

a spot blender, wherein the spot blender comprises the composition of claim 1 .

5. The coating system of claim 4 , wherein the urethane (meth)acrylate of the spot blender has isocyanate functional groups.

6. The coating system of claim 5 , wherein the urethane (meth)acrylate of the spot blender has hydroxyl groups.

7. The coating system of claim 4 , wherein the polymeric polyol of the spot blender comprises a (meth)acrylic polyol.

8. The coating system of claim 4 , wherein the coating system is radiation cured, thermally cured, or a combination thereof.

9. A method of repairing a damaged spot on an automotive substrate comprising:

(i) applying a clearcoat on the damaged spot;

(ii) applying a spot blender comprising a composition of claim 1 over the clearcoat; and

(iii) curing the applied clearcoat and spot blender.

10. The method of claim 9 , wherein the clearcoat comprises a polymer having (meth)acrylate unsaturation, a polyisocyanate, and optionally a polythiol.

11. The method of claim 9 , wherein prior to the step of applying the clearcoat, one or more of the following steps is performed:

(i) cleaning the damaged spot and/or its surroundings;

(ii) sanding and/or recleaning the damaged spot;

(iii) optionally, filling, sanding and/or cleaning the damaged spot;

(iv) optionally at least one of applying at least one of a filler or primer and/or flashing off a resultant filler film, curing the filler film and/or sanding and cleaning the resultant filler coat; and

(v) applying a basecoat material to the filler film, flashing off a resultant basecoat film, and removing any overspray on the damaged spot.

12. The method of claim 9 , wherein the urethane (meth)acrylate of the spot blender has isocyanate functional groups.

13. The method of claim 9 , wherein the spot blender comprises ≦0.07% by weight of the photoinitiator.

14. The method of claim 12 , wherein the urethane (meth)acrylate of the spot blender has hydroxyl groups.

15. The method of claim 9 , wherein the polymeric polyol of the spot blender comprises a (meth)acrylic polyol.

16. A composition comprising:

(a) 2 to 10% of a polymeric polyol;

(b) 1 to 5% of a urethane (meth)acrylate containing isocyanate groups;

(c) less than 0.1% of a photoinitiator; and

(d) 90 to 97% of solvent;

the percentages being by weight based on total weight of the composition.

17. The composition of claim 16 , wherein the polymeric polyol is a (meth)acrylic polyol.

18. The composition of claim 16 , wherein the composition comprises ≦0.07% by weight of the photoinitiator.

19. A coating system, comprising:

(a) a clearcoat, wherein the clearcoat comprises a polymer having (meth)acrylate unsaturation, a polyisocyanate, and optionally a polythiol; and

(b) a spot blender, wherein the spot blender comprises the composition of claim 16 .

20. A method of repairing a damaged spot on an automotive substrate comprising:

(i) applying a clearcoat on the damaged spot;

(ii) applying a spot blender comprising a composition of claim 16 over the clearcoat; and

(iii) curing the applied clearcoat and spot blender.