DIN 912 socket head cap screws are high-strength metric fasteners with a cylindrical head and internal hex drive, widely used in engineering, machinery, and precision assemblies for secure, high-torque fastening.
Bought this to try on uPVC window frames. They were fitted with a gunned mortar, then replaced with silicone then pointed with mortar. All fell out in the weather.
Researched different products and settled on CT1. Cleared out all the old products back to the builders foam and first filled the gaps and then finished with a neater bead. It has stayed in place through the recent hot weather and is looking good.
Fingers crossed this is the final solution.
It sticks very well but is difficult to get a good finish. Practice out of sight first.