Join Date: Apr 2008
Location: Shepperton, Middlesex
Re: removing spots
Bird **** isn't what you'd call a bonded contaminent, it's acidic and literally dissolves and penetrates the clearcoat and subsequent layers.
Contaminents lie on the surface or are partly-embedded in the clearcoat thus can be removed using clay.
The chap said that it was a Cif-type product which was spilled onto the paintwork, well, Bathroom/kitchen cleaners contain Alcohol, Ammonia, and Sulfates and will most certainly burn, dissolve, discolour, and penetrate a clearcoat.
Cellulose and urethane paints have very different characteristics and to the trained eye they are chalk and cheese, so the answer to your question is yes, I can almost definately define the paint type by looking at a picture, I wouldn't be very good at my job if I couldn't!