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Excellent product but be well prepared as the glue is very stiff. Our glue gun broke during the job causing the glue to stiffen further before we could complete the job. Recommend you buy a good quality heavy duty glue gun.
While these brackets are strong and well made, they are NOT safe for use and WILL fly off your RV or van, I suspect the failure is due to the recommended silka-flex adhesive. I'm very experienced and even professional in this sort of installation and the failure of this "system" isn't due to improper installation. All surfaces were cleaned and dryed with alcohol prior to glueing and all recommendations were followed, the product simply FAILED. AND COULD HAVE CAUSED A SEVERE ACCIDENT!!!!.
Edot: I should mention they did stick for almost a year and I never drive my van above 70mph which is less than the rated wind speed