Abstract Reaction products obtained by mixing under anhydrous conditions WHERE K IS 0 TO 20 AND A is methyl or vinyl and WHERE M IS 0 TO 5 AND Y IS 1 OR 2 ARE ADHESION PROMOTERS WHICH ARE USEFUL IN PRIMER COMPOSITIONS. The primer compositions are organic solvent solutions with 50 to 99.9 weight percent organic solvent, with the balance being made up of 5 to 100 weight percent of the adhesion promoter, 0 to 50 weight percent of an alkylsilicate and 0 to 50 weight percent of an organotitanate. An example of a primer composition would be a solution of 76.9 weight percent inhibited 1,1,1-trichloroethane with 23.1 weight percent of equal weight amounts of an adhesion promoter where A is vinyl, k is 3 and m has an average value of about 0.7, ethylpolysilicate and bis(acetylacetonyl)diisopropyltitanate. The primer compositions are useful in adhering room temperature vulcanizable silicone elastomers to substrates such as aluminum.