[RE-wrenches] Sealants versus flashings

[Phil Forest]

Geocell 4500 is our favorite sealant. Compatible with many different materials and stays flexible ( so far). And it doesn't smell toxic, either. Look out, it's sticky stuff, wear gloves. 
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Phil Forest
South Mountain Company

> On Apr 19, 2014, at 6:37 PM, Tom Lane <tom at ecs-solar.com> wrote:
> 
> Geocell 2300 is not a polyurethane sealant as far as I can determine and as I suggested ( read the label ) is compatible with asphalt shingles , it is a tripolymer but not a polyurethane . It is definitely better than silicones and Sikaflex . I have never found a polyurethane listed as compatible with asphaltic materials . All sealants should obviously be listed as compatible for the materials they are use on , have good UV resistance , and stay flexible or elastomeric from -40F to 200F . If your sealant meets those Four criteria then use it with confidence .
> 
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