Replaced an outside light, what is best to seal it with?

[securespark]

Yeah, it is failing.

It's 10 years since I picked up a pair of cutters in anger and many more since I last used that compound!

 

[Dutch85]

It’s not good practice. You need to seal the box to thd wall and seal the cable entry. Also (if there isn’t one) drill a 6mm drain hole in the bottom.
If you don’t do these things then your connection box will fill with water, and pop!

And using insulation tape round connectors is bad practice. The box itself is the containment. Sticky tape adds nothing but sticky.
Where on earth did you buy this thing?
Do you have a link to the product?

It was from dunelm. Here's the link https://www.dunelm.com/product/twain-outdoor-globe-glass-wall-light-1000189425

 

[sparkwright]

The light fitting, if new, should be manufactured to be waterproof.

Though the cable seals can sometimes end up having a larger than necessary hole - when you poke the cable through the cheap ones can split.

 

[securespark]

They are IP44, which is a minimum for external light fittings.