Crosslinkable polymer compositions

A composition comprising a first polysiloxane having two or more unsaturated groups, a first silanol compound, a first filler, a first hydride material having two or more hydride groups, and a catalyst for catalyzing a reaction between the unsaturated groups and the hydride groups, (a) the composition having a viscosity as measured by oscillatory rheology at 0.1 Hz and 1% strain at 25° C. that is at least ten-fold greater than a viscosity as measured by flow rheology at a frequency of 30 Hz at 25° C., (b) the composition curing when measured at 37° C. within a time period of 1 minute to 120 minutes, (c) after being allowed to anneal for a period of 7 days at 70° C., the composition having a viscosity as measured using oscillatory rheology at a frequency of 0.1 Hz and a strain of 1% at 25° C. or 37° C. is in the range of 3,000 to 40,000 Pa*s, (d) the composition having a combination of properties (a) and (b), (e) the composition having a combination of properties (a) and (c), (f) the composition having a combination of properties (b) and (c), or (g) the composition having a combination of properties (a), (b) and (c).