I've used PU18 which is designed for automotive / marine and industrial use. Very strong bond for most applications. I usually buy it through ebay sellers for about £4 per tube, it goes along way too.
With Sikaflex there are more than one type. The stuff sold through places such as Screw Fix is the cheaper DIY version which has lots of "filler" in it and less bonding material so its not as strong as the professional version.
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