Hahaha. I appreciate you greetings but ....
That's funny to hear how wrong people is about Spain weather. The concept you have comes from our South coast publicity for tourists.
Spain is the most Motainous country in Europe before Switzerland and the second regarding mean height over sea level, after Switzerland again (Most of our territory is around 1000m). Hence, appart from our south coasts, the weather is Mountain weather in most of the country, really cold and snowy during winter and quite hot (UV radiation) during summer, with cold nights all along the year.
Just now, we are around -10ºC at nights and around +1ºC at daylight, with quite a hard NW wind blowing from the Atlantic.
Sorry for this meteorology lecture, but .... my homeland is so different from that Touristic idea, that we are a little bit fed up.
Anyway, its true, our southeast coasts virtually have no winter becouse a mountains range running N-S isolates those lowlands from North and west winds,.... Foehn effect, you know? Thats the place mostly known abroad :-)
About cementing the endcaps ......
Be careful providing a homogeneus cement layer between parts.
The surfaces must be fully in contact with no bubbles.
The thinner the cement layer, the better.
Regards Holger. Dont hersitate asking anythig you need.