A curable composition comprising at least one curable polymer; at least one capped adhesion promoter of formula: B-R 11 -SiR 12 q (OR 13) 3-q wherein R 11 is a linear or branched alkylene group, optionally interrupted by a heteroatom, preferably selected from O, NR 14, S and Si(R 14) 2, preferably C 1 -C 10 alkylene, more preferably C 1 or C 3 alkylene; each R 12 is independently selected from the group consisting of hydrogen, halogen, amino, a substituted or unsubstituted alkyl, alkenyl, alkynyl, cycloaliphatic, aryl, heteroaryl, and heteroalicyclic group or a combination thereof; each R 13 is independently selected from the group consisting of a substituted or unsubstituted alkyl, alkenyl, alkynyl, or acyl group; each R 14 is independently selected from the group consisting of hydrogen, alkyl, alkenyl, alkynyl, cycloaliphatic, aryl, heteroaryl, and heteroalicyclic group or a combination thereof; q independently stands for 0 or 2; and B is a nitrogen-containing group of formula -NR 15 R 16 wherein R 15 is selected from -Si(R 17) 3; R 16 is selected from -Si(R 17) 3 and alkyl substituted with -Si(R 17) 3; and each R 17 is independently selected from hydrogen, a substituted or unsubstituted alkyl, alkenyl, alkynyl, cycloaliphatic, or aryl group or a combination thereof; or wherein R 15 and R 16 combine to form together with the nitrogen atom to which they are attached a group of formula -Si(R 17) 2 -R 18 -Si(R 17) 2 -, wherein R 18 is a linear or branched alkylene group, preferably C 2 or C 3 alkylene; and optionally at least one curing catalyst. at least one curable polymer; at least one capped adhesion promoter of formula: B-R 11 -SiR 12 q (OR 13) 3-q wherein R 11 is a linear or branched alkylene group, optionally interrupted by a heteroatom, preferably selected from O, NR 14, S and Si(R 14) 2, preferably C 1 -C 10 alkylene, more preferably C 1 or C 3 alkylene; each R 12 is independently selected from the group consisting of hydrogen, halogen, amino, a substituted or unsubstituted alkyl, alkenyl, alkynyl, cycloaliphatic, aryl, heteroaryl, and heteroalicyclic group or a combination thereof; each R 13 is independently selected from the group consisting of a substituted or unsubstituted alkyl, alkenyl, alkynyl, or acyl group; each R 14 is independently selected from the group consisting of hydrogen, alkyl, alkenyl, alkynyl, cycloaliphatic, aryl, heteroaryl, and heteroalicyclic group or a combination thereof; q independently stands for 0 or 2; and B is a nitrogen-containing group of formula -NR 15 R 16 wherein R 15 is selected from -Si(R 17) 3; R 16 is selected from -Si(R 17) 3 and alkyl substituted with -Si(R 17) 3; and each R 17 is independently selected from hydrogen, a substituted or unsubstituted alkyl, alkenyl, alkynyl, cycloaliphatic, or aryl group or a combination thereof; or wherein R 15 and R 16 combine to form together with the nitrogen atom to which they are attached a group of formula -Si(R 17) 2 -R 18 -Si(R 17) 2 -, wherein R 18 is a linear or branched alkylene group, preferably C 2 or C 3 alkylene; and R 11 is a linear or branched alkylene group, optionally interrupted by a heteroatom, preferably selected from O, NR 14, S and Si(R 14) 2, preferably C 1 -C 10 alkylene, more preferably C 1 or C 3 alkylene; each R 12 is independently selected from the group consisting of hydrogen, halogen, amino, a substituted or unsubstituted alkyl, alkenyl, alkynyl, cycloaliphatic, aryl, heteroaryl, and heteroalicyclic group or a combination thereof; each R 13 is independently selected from the group consisting of a substituted or unsubstituted alkyl, alkenyl, alkynyl, or acyl group; each R 14 is independently selected from the group consisting of hydrogen, alkyl, alkenyl, alkynyl, cycloaliphatic, aryl, heteroaryl, and heteroalicyclic group or a combination thereof; q independently stands for 0 or 2; and B is a nitrogen-containing group of formula -NR 15 R 16 wherein R 15 is selected from -Si(R 17) 3; R 16 is selected from -Si(R 17) 3 and alkyl substituted with -Si(R 17) 3; and each R 17 is independently selected from hydrogen, a substituted or unsubstituted alkyl, alkenyl, alkynyl, cycloaliphatic, or aryl group or a combination thereof; or wherein R 15 and R 16 combine to form together with the nitrogen atom to which they are attached a group of formula -Si(R 17) 2 -R 18 -Si(R 17) 2 -, wherein R 18 is a linear or branched alkylene group, preferably C 2 or C 3 alkylene; and optionally at least one curing catalyst.