I thought I'd just post quickly to let people in the UK know that you can now get Sikaflex EBT at Screwfix. It's slightly more than on line but works out with shipping. They have black, white and grey.
I prefer to use Sikaflex EBT to top up on all kinds of grip. It interacts well with other sealants, keeping the pliability of the base grip, but gives a nice durable top up.
I did a video a while back on topping up grip:
At some point I really do have to do one that's a bit more punchy! 😀