The recommended products are either ;-
Xyladecor -http://www.xyladecor.es/products/exterior/products_exterior_woodstain.html
or
Xylazel - http://www.xylazel.com/index.php?idMenu=2&idIdioma=1&padreURL=11&mostrarHijos=si&hijoURL=30
I believe that Matt is better as it soaks into the wood more, whereas the satin forms a film on the surface which is prone to flake in the sun.
At the end of the day the choice of product is down to you, you get what you pay for, the main thing is that 1) the wood is treated and 2) there is a uniformity of colour within the garden.
Which brings us to the next point. Not all the Jardines use the same colour.
Jardine 8-13 NOGAL, but lower down some Jardines change. La Isla - NOGAL. Los Naranjos mostly NOGAL but some Caoba. Penthouses - CASTANO, WENGUE is on the gates only.
Yes I know, but before you all start moaning please remember that this is not the communities fault, Polaris did the original staining so the lack of a single uniform colour was down to them.