The likelihood is that the existing paint is a standard oil based wood primer, undercoat and gloss. And this should be sufficient although you could upgrade to Dulux Weathersield as it is a fair bit more flexible over the long term.
The advantage of micro-porous paints, in theory, is that they allow moisture vapour to escape without letting water in so this shouldn’t be an issue. The micro-porous paints, such as Weathershield, have the added advantage of being formulated purely for exterior use so they are worth paying the extra few quid for.
If you have to paint the panels again in-situ try and get as much paint as you can into the gaps. Do these first with a small brush and let the paint dry, then do all the surface with a second coat otherwise you’ll have problems with drips forming from the grooves and spoiling the finished job.
I’ve had a look this morning and you are right, there is some paint in the panel joints but it is patchy and thin. So its going to be a small brush and a tin of Weathershield when the weather settles down! Then I’ll see how it goes over winter before doing anything more drastic. READ MORE...
All the best