http://www.siliconesolutions.com/prod/market.php - very high viscosity
SS4060 , SS 6060
180 mins @ room temp

all of below have resistivity on 10^15 ohms*cm
http://www.dowcorning.com/applications/search/products/details.aspx?prod=03322921&type=PROD

Dow Corning® 3-4150 -- all were ordered 11/12
Dielectric Gel Kit 
2-part, transparent green, 1:1 mix ratio, fast room- 
temperature-cure gel 
Fast room-temperature cure; blue and yellow parts turn green when 
mixed 
pretty hard
90 minute room-temp cure, no heat cure

Dow Corning® 3-4680 
Silicone Gel Kit 
2-part, transparent blue, 1:1 mix ratio, fast room-tem- 
perature-cure gel 
Fast room-temperature cure; transparent blue; low viscosity 
30 min @ room temp cure, pretty soft, very low viscosity

Dow Corning® 3-4170 
Dielectric Gel Kit 
2-part, soft clear, 1:1 mix ratio gel Clear gel; fast heat cure; long working time and low viscosity - softer aid 
process flexibility and impregnation potentially without vacuum 
needs heat cure - 9 mins at 100C

Sylgard® 3-6636 Silicone 
Dielectric Gel Kit 
2-part, clear, 1:1 mix ratio, high-viscosity gel Clear, fast heat-curing gel; high viscosity-pretty hard 
45 min @ 100C 3.5 hr at room temp