I use NO SWEAT by ProTouch.
You can probably get it on Amazon.co.uk

You can also get an Anti Androgen roll-on by prescription.
It cuts off the sweat glands.

But using normal deodorants is not a good idea.
The deodorant stops the adhesion when you first apply it.
Then, when you sweat a white slime appears and mixes with the adhesive & is visible.

Make sure you have a fan going when you attach in this hot weather and keep cool for several hours afterwards.