NOVELTY - A pressure sensitive adhesive composition comprises an uncured rubbery polymer blend including ethylene propylene norbomadiene terpolymers or ethylene propylene dicyclopentadiene terpolymer, ethylene propylene hexadiene terpolymer, chlorobutyl rubber, and polyisobutylene; at least one tackifier and a curing agent blend, where the tackifier includes a phenolic tackifier resin, and curing agent blend includes a cure accelerator, sulfur activator and curing vulcanizing agent; and polybutene homopolyme; and desiccant present in an amount from 2-8 wt.%.    USE - For attaching a solar module to substrate (claimed).    ADVANTAGE - The pressure sensitive adhesive composition has a tensile strength of 5-40 pounds per square inch (psi) when uncured and has tensile strength of 50-100 psi when cured. The pressure sensitive adhesive composition is operable to secure a component to a substrate; is able to cure in place without additional steps to a hard condition; has meet weatherability and strength criteria such as resistance to ultra-violet radiation exposure, freeze and thaw cycles, rain, snow, sleet, and hail exposure, wind uplift forces, and extremes in temperature. The composition exhibits initial tackiness when uncured and high strength when cured.    DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for a solar module assembly attachable to a substrate comprising a solar module having a bottom surface; an adhesive layer having a first surface and a second surface, where the first surface is in contact with at least a portion of the bottom surface of the solar module, the adhesive layer comprises (wt.%): an upcured rubbery polymer blend (10-60); at least one of tackifier (5-25) and a curing agent blend (1-5), where the tackifier includes a phenolic tackifier resin, and the curing agent blend includes a cure accelerator, a sulfur activator, and a curing vulcanizing agent; and a polybutene homopolymer (20-60); and a release liner covering the second surface of the adhesive layer, where the release liner is removable from the adhesive layer, and adhesive layer cures after the release liner has been removed to attach the solar module to the substrate.