A room temperature curable encapsulation/potting material composition comprising: (i) at least one condensation curable silyl terminated polymer having at least one, typically at least 2 Si- hydroxyl functional groups per molecule; (ii) a cross-linker selected from the group of - silanes having at least 2 hydrolysable groups, alternatively at least 3 hydrolysable groups per molecule group; and/or - silyl functional molecules having at least 2 silyl groups, each silyl group containing at least one hydrolysable group. (iii) a condensation catalyst selected from the group of titanates and zirconates characterized in that: the composition additionally comprises one or more adhesion promoters in an amount of 0.1 to 2 wt. % of the total composition; - the molar ratio of the sum of moisture present in the formulation, as determined in accordance with ISO 787-2:1981 and total silicon bonded hydroxyl groups: the catalyst is > 7:1; and (a) when the molar ratio of the sum of moisture present in the formulation, as determined in accordance with ISO 787-2:1981 and total silicon bonded hydroxyl groups: the catalyst is from > 7:1 to 10:1 the molar ratio of total silicon bonded hydroxyl groups: total hydrolysable groups is between 0.1:1 to 0.3:1 and (b) when the molar ratio of the sum of moisture present in the formulation, as determined in accordance with ISO 787-2:1981 and total silicon bonded hydroxyl groups: the catalyst is from > 10:1 the molar ratio of total silicon bonded hydroxyl groups: total hydrolysable groups is between 0.1:1 to 0.5:1. (i) at least one condensation curable silyl terminated polymer having at least one, typically at least 2 Si- hydroxyl functional groups per molecule; (ii) a cross-linker selected from the group of - silanes having at least 2 hydrolysable groups, alternatively at least 3 hydrolysable groups per molecule group; and/or - silyl functional molecules having at least 2 silyl groups, each silyl group containing at least one hydrolysable group. - silanes having at least 2 hydrolysable groups, alternatively at least 3 hydrolysable groups per molecule group; and/or - silyl functional molecules having at least 2 silyl groups, each silyl group containing at least one hydrolysable group. (iii) a condensation catalyst selected from the group of titanates and zirconates characterized in that: the composition additionally comprises one or more adhesion promoters in an amount of 0.1 to 2 wt. % of the total composition; - the molar ratio of the sum of moisture present in the formulation, as determined in accordance with ISO 787-2:1981 and total silicon bonded hydroxyl groups: the catalyst is > 7:1; and (a) when the molar ratio of the sum of moisture present in the formulation, as determined in accordance with ISO 787-2:1981 and total silicon bonded hydroxyl groups: the catalyst is from > 7:1 to 10:1 the molar ratio of total silicon bonded hydroxyl groups: total hydrolysable groups is between 0.1:1 to 0.3:1 and (b) when the molar ratio of the sum of moisture present in the formulation, as determined in accordance with ISO 787-2:1981 and total silicon bonded hydroxyl groups: the catalyst is from > 10:1 the molar ratio of total silicon bonded hydroxyl groups: total hydrolysable groups is between 0.1:1 to 0.5:1. - the molar ratio of the sum of moisture present in the formulation, as determined in accordance with ISO 787-2:1981 and total silicon bonded hydroxyl groups: the catalyst is > 7:1; and (a) when the molar ratio of the sum of moisture present in the formulation, as determined in accordance with ISO 787-2:1981 and total silicon bonded hydroxyl groups: the catalyst is from > 7:1 to 10:1 the molar ratio of total silicon bonded hydroxyl groups: total hydrolysable groups is between 0.1:1 to 0.3:1 and (b) when the molar ratio of the sum of moisture present in the formulation, as determined in accordance with ISO 787-2:1981 and total silicon bonded hydroxyl groups: the catalyst is from > 10:1 the molar ratio of total silicon bonded hydroxyl groups: total hydrolysable groups is between 0.1:1 to 0.5:1. (a) when the molar ratio of the sum of moisture present in the formulation, as determined in accordance with ISO 787-2:1981 and total silicon bonded hydroxyl groups: the catalyst is from > 7:1 to 10:1 the molar ratio of total silicon bonded hydroxyl groups: total hydrolysable groups is between 0.1:1 to 0.3:1 and (b) when the molar ratio of the sum of moisture present in the formulation, as determined in accordance with ISO 787-2:1981 and total silicon bonded hydroxyl groups: the catalyst is from > 10:1 the molar ratio of total silicon bonded hydroxyl groups: total hydrolysable groups is between 0.1:1 to 0.5:1.