"Rob G" wrote in message
...
On 7 Apr, 10:41, "Bob Mannix" wrote:
"cynic" wrote in message



Once the guttering has been subject to uv degradation and embrittlement,
changing the seals can be a problem (if you can get them). OTOH if they
are
not leaking now, leave well alone until they are - if they do leak it
will
start very slowly (drips). You can always pop some mastic in them, get a
few
more years out of them and then change them. I suspect you are
over-worrying!

--
Bob Mannix
(anti-spam is as easy as 1-2-3 - not)

From someone who does have the odd joint in plastic guttering that is
dripping slightly, what is the best way of applying some mastic.
Obviously a bit of cleaning up but do I need to spring the joint and
get the mastic into the joint ?


Springing the joint and putting it inside would be the best - as someone
else has said, it does tend to move, plus the inside gap is full of cr*p.
Sometimes, springing the joint and cleaning will improve things (assuming
that springing the joint doesn't cause something to snap - they will be much
more brittle than when new) and applying silicone grease. If you can get
replacement seals that's the best but I haven't come across any for sale.
You can also try car underseal etc. Yes it's a bodge but it may buy you
another year and, if you are going to replace in the end, what's the
problem?


--
Bob Mannix
(anti-spam is as easy as 1-2-3 - not