A glass adhesion composition containing a copolymer having an acid and a substituted amide, silanol, or amine oxide functionality. The substituted amide, silanol, or amine oxide functionality provide excellent adhesion of the copolymer to glass, silica, sand and other silicon-based substances. The copolymer is useful as a fiberglass binder, and also useful in providing protective coatings on glass sheets. A fiberglass sizing composition is also provided having a copolymer that includes at least one acid group derived from at least one acid monomer, a hydrophobic comonomer, and a crosslinker. Additives can be added to the compositions to provide other functionality such as corrosion inhibitors, hydrophobic additives, additives for reducing leaching of glass, release agents, acids for lowering pH, anti-oxidants/reducing agents, emulsifiers, dyes, pigments, oils, fillers, colorants, curing agents, anti-migration aids, biocides, plasticizers, waxes, anti-foaming agents, coupling agents, thermal stabilizers, flame retardants, enzymes, wetting agents, and lubricants.