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SEIKO GL-831 and XGL-831 divers straps ...

Natural rubber
is made from the sap of the rubber tree, which is drained off, heated, and formed into rubber parts. Rubber has many uses; it is water-resistant, flexible, strong, and elastic. That said, over time natural rubber will tend to dry out, stiffen, and crack.

Restoration / Reconditioning of ur GL-831

gently rinse with warm water and a mild soap cleaning off any excess dirt improve the strap aesthetically and will help prevent future wear and tear as dirt chafes the rubber against surfaces over time.

SECOND boil some water in the saucepan, when at a boil turn of the stove and submerge the strap in the boiling hot water. Every 5 minutes or so, remove the strap using tongs and test its flexibility and condition, Dry off excess water and let the strap sit submerged in some ALMOND OIL for 15 minutes to help in reconditioning and restoring lost flexibility ... wipe off excess oil and Ur diver strap should be back in business.

Photos below of end result of what i suggested above on my GL-831 strap from 1972 that was stiff, hard, and rigid into a soft, flexible and pliable almost new diver strap feel and look

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