leaks in pvc gutters

We had a small job today, just a replacement of black pvc gutters with black seamless aluminium gutters.
the client was having problems with leaks at the joints of the black pvc gutters, This can occur when the pvc gutters are exposed to heat from the sun and expand, or even contract due to the cold, this causes the gutter to creep from the joints and leak.
the seamless gutter solves this problem because it is made to measure in one piece.
I hope this information is useful to someone.