Outside Wood On A House ??

[grahammlong]

Dear good AB'ers. Outside wood on a house ? - got a lot of quality supplies already to do this - already so cost not an issue, - just effort . .... But (1) with white painted wood , worth rubbing down to bare wood , then applying wood preserver THEN quality undercoat then gloss or satin. With (2) brown wood ( House Fascia , solid wood fence etc. ) , worth , rubbing down to bare wood , then applying wood preserver THEN wood stain, then varnish ?? Making sure everything is dry thoroughly .. before next coat ! = Important - Plan to use a detail sander, a delta sander and a random orbit sander where applicable and use say 80 , 120 and 220 grit sandpaper to keep it simple - It this a fair plan , so won't have to do the same for a few years ? - any pitfalls to be aware of ? THANK YOU good AB'ers GL.

[Stephen_G]

If your white painted wood is in good order, you wouldn't need the preserver. You just need to make sure your Primer/Undercoat and Gloss/Satin are the same base - oil or water-based.

Similar answer with the brown wood. I wouldn't put on a stain then a varnish, unless you use a satin finish, to keep the fence looking dull - do you want a glossy-looking fence? Ronseal are now doing a 10-year woodstain (To replace their 5-year product) - available in Satin only. Adding more coats to your brown wood might darken the finish, so you might want to have a look at the colours and decide from there.

Probably stick with the 120 and 220-grade sandpaper, and the orbit sander on a slow setting, using the detail sander for the difficult bits.

[The Builder]

I agree with Stephen. There is no need for preserver. I've had problems with this before. The idea of a primer is to have it soak into the timber to provide a good key for the following coats.

Preservers, in my experience, can be "oily", likely to throw off further paint coats.

I'm going to upset a few people now by saying that I no longer use conventional undercoat/gloss type coatings. There are plenty of great microporous coloured stains available now. One I use often is "Solignum". Dulux/Sadolin have an even greater range of colours.

With Solignum, you just rub down, then put on 2 coats to finish. No primers, undercoats etc. Not even any knotting needed.

https://www.promain.co.uk/manufacturers/solignum/architectural-water-based-opaque.html