Product Description

TremPro JS-773 is a high solids, non-skinning, non-drying, synthetic, butyl elastomer sealant.

Basic Uses

It is designed for field caulking of panel joints and can be
used for in-plant applications. TremPro JS-773 is also ideal for buttering or bedding non-porous components that are squeezed together by fastening or for field caulking of the interior panel joints of PEMB panels. It can be used to separate dissimilar metals to prevent galvanic action.

The product exhibits excellent adhesion to a variety of metals and metal finishes including hot-dip galvanized steel, Galvalume®, Kynar 500®, stainless steel, polyvinylidene fluoride (PVDF), aluminum, and fiberglass.




10.1 fl.oz. cartridges, Quart (850 ml) cartridge, 20 oz. (600 ml) sausages, 5 gallon pails and 52 gallon drums.

INSTALLATION Surface Preparation

For good adhesion, the joint surface must be sound, clean and dry. 

Tooling & Cleaning

Tooling is recommended immediately after application to insure firm, intimate contact with the joint interface. Dry tooling is preferred. Excess sealant and smears adjacent to the joint can be removed with mineral spirits or a similar solvent.


TremPro JS-773 is easily applied with conventional caulking equipment. Pails and drums can be applied with standard pumps. Tremco recommends a minimum 20:1 ratio pump. TremPro JS-773 will adhere to substrate and mating surfaces in temperatures ranging from -5°F (-20°C) to 120°F (49°C). Product should be stored at room temperature to ensure optimal product performance.

After application is complete, assemble components within
24 hours to prevent tracking and dirt pick-up that may inhibit adhesion. For extended storage conditions recommendation, please consult Tremco Technical Services at 1-866-209-2404. Extended exposure under elevated temperatures may alter the non-skinning and non-drying characteristics of the sealant.


Damaged Sealant can be repaired. Consult Tremco Technical Services or a Sales Representative for repair procedures.


Not recommended for use on exposed applications.