GB wrote:
We have an outside light - an oblong plastic thingy - in a rather
exposed position. I opened it up to change the bulb, and there was some
water inside. What's the best way to stop this?

I thought of putting a couple of drain holes in the bottom, but that
seems too bodgy even for me.

The two parts of the lamp push together with a flange, but there's no
rubber seal between them. Is there any simple way of making a seal that
will still allow me too open the lamp again to change the bulb?



It looks similar to this one:

http://www.screwfix.com/p/lap-anti-v...ack-240v/31250


But that one is waterproof!
Drain holes in the lowest point are the way to go.

An outside container is very difficult to fully seal as thermal
expansion/contraction will act as a pump admitting small amounts of
water vapour laden air. The water condenses and stays inside and on the
next heating cycle the air gets pushed out but the water does not and so
it slowly builds up as the cycle repeats.
You still really need some sort of seal against driving rain. I often
use a silicone grease - Dow Corning MS4* smeared over the sealing faces
and wipe off any excess that squeezes out when you fit the cover.

* I think it has another name now (DC4?) but my toothpaste sized tube
will see me out so I've not bought any of the new name stuff.