old painted surface do I need to use the primer?

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Hi I am painting some timber cladding on the front of my house. While I was preparing it a few bits of old paint came off exposing the timber but on the whole 80/90% of the old paint is sound, just tired looking.

I bought some Sikkens Rubbol XD Gloss and some of the recommended primer to go with it, Sikkens Rubbol Primer Plus. Where should I use the primer i.e. should I prime the lot as it will give a better job or do I just prime the few bare bits?

I was thinking perhaps the proper prime will give a better base for the top coat to bind to rather than some old unknown paint but at the same time I wondered if it was a bit silly priming an already painted surface.

Any advice or help would be appreciated.
 
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Prime all bare timber, then undercoat all timber, then gloss.

If possible give 2 coats of undercoat.

Andy
 

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