An adhesion mediator composition comprising (i) A trialkoxysilane, of the formula Si 3 R 1 wherein each R may be the same or different and is an alkyl group having at least two carbons per group and each R 1 may be the same or different and is an unsaturated group selected from an alkenyl group or an alkynyl group; which trialkoxysilane is present in an amount of from 20 to 45 wt. % of the composition; (ii) A platinum group metal based hydrosilylation reaction catalyst in which platinum group metal is present in an amount of from 0.1-1.5 wt. % of the composition; (iii) An alkoxy titanium compound having from 2 to 4 alkoxy groups in an amount of from 1 to 10 wt. %; (iv) A tetraalkoxysilane of the formula Si(OR 2) 4, wherein each R 2 may be the same or different and is an alkyl group having at least two carbons per group, which tetraalkoxysilane in an amount of from 5 to 20 wt. % of the composition; and (v) Either (a') a polyorganosiloxane containing at least two unsaturated groups, selected from alkenyl groups and alkynyl groups, per molecule and having a viscosity in a range of 50 mPa.s to 9000 mPa.s using a Brookfield TM viscometer with an RV-4 Spindle at 20 rpm at 25°C; or (b') a mixture of two or more polyorganosiloxanes containing at least two unsaturated groups, selected from alkenyl groups and alkynyl groups, per molecule, which mixture has a viscosity in a range of 50 mPa.s to 9000 mPa.s using a Brookfield TM viscometer with an RV-4 Spindle at 20 rpm at 25°C; wherein said component (v) is present in an amount of from 25 to 60 wt. % of the composition. (i) A trialkoxysilane, of the formula Si 3 R 1 wherein each R may be the same or different and is an alkyl group having at least two carbons per group and each R 1 may be the same or different and is an unsaturated group selected from an alkenyl group or an alkynyl group; which trialkoxysilane is present in an amount of from 20 to 45 wt. % of the composition; (ii) A platinum group metal based hydrosilylation reaction catalyst in which platinum group metal is present in an amount of from 0.1-1.5 wt. % of the composition; (iii) An alkoxy titanium compound having from 2 to 4 alkoxy groups in an amount of from 1 to 10 wt. %; (iv) A tetraalkoxysilane of the formula Si(OR 2) 4, wherein each R 2 may be the same or different and is an alkyl group having at least two carbons per group, which tetraalkoxysilane in an amount of from 5 to 20 wt. % of the composition; and (v) Either (a') a polyorganosiloxane containing at least two unsaturated groups, selected from alkenyl groups and alkynyl groups, per molecule and having a viscosity in a range of 50 mPa.s to 9000 mPa.s using a Brookfield TM viscometer with an RV-4 Spindle at 20 rpm at 25°C; or (b') a mixture of two or more polyorganosiloxanes containing at least two unsaturated groups, selected from alkenyl groups and alkynyl groups, per molecule, which mixture has a viscosity in a range of 50 mPa.s to 9000 mPa.s using a Brookfield TM viscometer with an RV-4 Spindle at 20 rpm at 25°C; wherein said component (v) is present in an amount of from 25 to 60 wt. % of the composition. (a') a polyorganosiloxane containing at least two unsaturated groups, selected from alkenyl groups and alkynyl groups, per molecule and having a viscosity in a range of 50 mPa.s to 9000 mPa.s using a Brookfield TM viscometer with an RV-4 Spindle at 20 rpm at 25°C; or (b') a mixture of two or more polyorganosiloxanes containing at least two unsaturated groups, selected from alkenyl groups and alkynyl groups, per molecule, which mixture has a viscosity in a range of 50 mPa.s to 9000 mPa.s using a Brookfield TM viscometer with an RV-4 Spindle at 20 rpm at 25°C;