New skirting boards in redwood. Do we need to knot block?

spiritus

We're having the old skirting boards removed and have ordered new redwood boards.

I am trying to find a comprehensive bullet point of things we need to do before we use a top coat but as expected, different websites give different advice.

I believe that pine/redwood can be knotty and to avoid the knots bleeding after they've been painted then the knots need to be specifically treated-is this recommended?

If we treat the knots then I'm guessing a primer and then a top coat?

Have I missed anything?

maisie_cat

I tend towards using zinsser cover stain using a varnish roller as a knot sealing/primer coat
It's much easier than knotting and provides a good coat for undercoat then topcoat in my experience. 

tacpot12

It is recommended that the knots are treated. Because knots are of a different texture, colour and density from the background wood, knots absorb wood finishes differently. If you try to paint a new, knotty skirting board the knots will show through your paint, staining it no matter how many coats you use and whether you use gloss or something water-based.

You need to carefully apply the right number of coats of knotting solution. I would tend to apply the first few coats just over the knots, but apply the final coat over the whole board. This should ensure that the surface you will be priming has the same absorbancy as the knots.  
 

donemedosh

Zinsser BIN sealer & stain killer shellac is the best thing to use. Paint the whole skirting board not just the knots & you do not need to undercoat just apply the colour of paint you want.

tacpot12

donemedosh said:

Zinsser BIN sealer & stain killer shellac is the best thing to use. Paint the whole skirting board not just the knots & you do not need to undercoat just apply the colour of paint you want.

I know BIN is good stuff, but I hadn't thought to use is for priming a skirting board. Thanks for the tip!