A composition for forming a cured polymer composition comprising: a polymer having at least a reactive silyl group, and has the formula: R 2 3-a R 1 a Si-Z- [R 2 SiO] x [R 1 2 SiO] y -Z-SiR 1 a R 2 3-a whereby x is 0 to 10000; y is 0 to 1000; a is 0 to 2; R is methyl; R 1 is chosen from a C 1 -C 10 -alkyl; a C 1 -C 10 alkyl substituted with one or more of Cl, F, N, O or S; a phenyl; a C 7 -C 16 alkylaryl; a C 7 -C 16 arylalkyl; a C 2 -C 4 polyalkylene ether; or a combination of two or more thereof, and other siloxane units may be present in amounts less than 10 mol.% preferably methyl, vinyl, phenyl; R 2 is chosen from OH, a C 1 -C 8 -alkoxy, a C 2 -C 18 -alkoxyalkyl, an oximoalkyl, an enoxyalkyl, an aminoalkyl, a carboxyalkyl, an amidoalkyl, an amidoaryl, a carbamatoalkyl, or a combination of two or more thereof, and Z is -O-,bond, or -C 2 H 4 -; a crosslinker or chain extender chosen from an alkoxysilane, an alkoxysiloxane, an oximosilane, an oximosiloxane, an enoxysilane, an enoxysiloxane, an aminosilane, a carboxysilane, a carboxysiloxane, an alkylamidosilane, an alkylamidosiloxane, an arylamidosilane, an arylamidosiloxane, an alkoxyaminosilane, an alkaryaminosiloxane, an alkoxycarbamatosilane, an alkoxycarbamatosiloxane, and combinations of two or more thereof; about 0.01- 7 parts per weight per 100 parts per weight of the polymer of a catalyst selected from the group of organometalic compounds or salts of iron or bismuth (Bi-III); at least one adhesion promoter chosen from a silane or siloxane other than the compounds listed under; optionally, a filler component; and at least one acidic compound chosen from a phosphate ester, a phosphonate, a phosphite, a phosphine, a sulfite, a pseudohalogenide, a branched alkyl carboxylic acid, and a combination of two or more thereof. a polymer having at least a reactive silyl group, and has the formula: R 2 3-a R 1 a Si-Z- [R 2 SiO] x [R 1 2 SiO] y -Z-SiR 1 a R 2 3-a whereby x is 0 to 10000; y is 0 to 1000; a is 0 to 2; R is methyl; R 1 is chosen from a C 1 -C 10 -alkyl; a C 1 -C 10 alkyl substituted with one or more of Cl, F, N, O or S; a phenyl; a C 7 -C 16 alkylaryl; a C 7 -C 16 arylalkyl; a C 2 -C 4 polyalkylene ether; or a combination of two or more thereof, and other siloxane units may be present in amounts less than 10 mol.% preferably methyl, vinyl, phenyl; R 2 is chosen from OH, a C 1 -C 8 -alkoxy, a C 2 -C 18 -alkoxyalkyl, an oximoalkyl, an enoxyalkyl, an aminoalkyl, a carboxyalkyl, an amidoalkyl, an amidoaryl, a carbamatoalkyl, or a combination of two or more thereof, and Z is -O-,bond, or -C 2 H 4 -; x is 0 to 10000; y is 0 to 1000; a is 0 to 2; R is methyl; R 1 is chosen from a C 1 -C 10 -alkyl; a C 1 -C 10 alkyl substituted with one or more of Cl, F, N, O or S; a phenyl; a C 7 -C 16 alkylaryl; a C 7 -C 16 arylalkyl; a C 2 -C 4 polyalkylene ether; or a combination of two or more thereof, and other siloxane units may be present in amounts less than 10 mol.% preferably methyl, vinyl, phenyl; R 2 is chosen from OH, a C 1 -C 8 -alkoxy, a C 2 -C 18 -alkoxyalkyl, an oximoalkyl, an enoxyalkyl, an aminoalkyl, a carboxyalkyl, an amidoalkyl, an amidoaryl, a carbamatoalkyl, or a combination of two or more thereof, and Z is -O-,bond, or -C 2 H 4 -; a crosslinker or chain extender chosen from an alkoxysilane, an alkoxysiloxane, an oximosilane, an oximosiloxane, an enoxysilane, an enoxysiloxane, an aminosilane, a carboxysilane, a carboxysiloxane, an alkylamidosilane, an alkylamidosiloxane, an arylamidosilane, an arylamidosiloxane, an alkoxyaminosilane, an alkaryaminosiloxane, an alkoxycarbamatosilane, an alkoxycarbamatosiloxane, and combinations of two or more thereof; about 0.01- 7 parts per weight per 100 parts per weight of the polymer of a catalyst selected from the group of organometalic compounds or salts of iron or bismuth (Bi-III); at least one adhesion promoter chosen from a silane or siloxane other than the compounds listed under; optionally, a filler component; and at least one acidic compound chosen from a phosphate ester, a phosphonate, a phosphite, a phosphine, a sulfite, a pseudohalogenide, a branched alkyl carboxylic acid, and a combination of two or more thereof.