The dap sounds like a good alternative. I was searching around last night and found some other possible alternatives.
Sashco (Sealants) 14010 "Through The Roof" Elastomeric Roof Sealant 10.1 Oz. - Clear
http://www.acehardwareoutlet.com/pro...rce=GoogleBase
Sashco (Sealants) 14004 "Through The Roof" Roof Sealant 1Gal.
http://www.acehardwareoutlet.com/pro...rce=GoogleBase
CRL Clear Dow Corning Silicone Glazing Sealant
http://www.dkhardware.com/product-17...g-sealant.html
Elastomeric Epoxies
http://www.epoxy.com/elastomeric.aspx
Sashco (Sealants) 14010 "Through The Roof" Elastomeric Roof Sealant 10.1 Oz. - Clear
http://www.acehardwareoutlet.com/pro...rce=GoogleBase
Sashco (Sealants) 14004 "Through The Roof" Roof Sealant 1Gal.
http://www.acehardwareoutlet.com/pro...rce=GoogleBase
CRL Clear Dow Corning Silicone Glazing Sealant
http://www.dkhardware.com/product-17...g-sealant.html
Elastomeric Epoxies
http://www.epoxy.com/elastomeric.aspx
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