evor1,
StompGrip’s adhesive agent has a shelf-life, it's not commonly discussed; however it can (and will) degrade over the course of time despite containment within a sealed package; this cycle is subject to acceleration if temperature cycled.
FWIW, I have a great deal of experience with the product; it has enabled me to continue riding and racing despite significant physical disability; therefore I'll continue promote the product with positive encouragement. That said, its highly advisable product is applied within the first six to twelve months of manufacture; once cured it appears product stability equalizes.
As I’m sure your aware, the preparation process prior to application is essential; out of the dozens of race bikes (and street bikes) in that I’ve utilized StompGrip, my preparation consists of an initial surface cleaning with a moderate household detergent (i.e. Dawn); a successive chemical cleaning is then performed with a commercial wax and grease remover; to many it has a commercial name of PrepSol™ (Origin: Dupont); I’ve had excellent success with a comparable product labeled as “H.E.T SuperKleen #1705”. Once the surface is washed, dried and chemically degreased; I then use a heat gun (lowest setting); elevating the outer surface temperature prior to product application. It is possible to utilize a hand-held hairdryer; avoid overheating the surface, as your goal is simply to promote adhesion.
Once the temperature is at a desired level (i.e. 98/99-degrees), I’ll begin the application process in a manner that minimizes the creation of air pockets; I find that working in 15-20mm increments has the best results. On a side note, prior to application I pre-fit the product by utilizing reference/alignment markers; these reference marks are easily removed with the chemical degreaser once curing has completed within 48-hours. It’s far easier to insure an accurate and trouble-free application with reference/alignment markers; thus eliminating peel and reply attempts that clearly weaken the 3M™ 300LSE adhesive.
In closing, I’ll gladly continue to recommend/utilize StompGrip; honestly the performance return provided clearly exceeds any preparation and/or application complexities necessary to insure ideal adhesion. I’m certain you’ll discover the same.
Thanks!