Roberlo Multiextender 750ml Universal light polyester putty. Very easy to spread, easy sanding and excellent adhesion to all substrates.The main advantage in comparison with standard polyester putties is its good adhesion to both galvanized metals and to aluminum.Its excellent adhesion is achieved maintaining all the qualities that a good putty is requested to have such as easy application, fast drying and easy sanding (beginning with 120 abrasive paper).See more at. http://en.roberlo.com/products/auto-body-repair/complementary-products/putties/multiextender/