Sap and knots

[tomredsky]

I used to like timber for skirting and architrave but now that I've got to prime and fill it myself, I wished the chippy had bought MDF.
I've got pine sap running out of this door linning and there's a ton of knots in the skirting that I know will bleed through unless I get my prep right.
I've got some Ronseal knot block primer and undercoat. Any other advice that will give me a decent finish?

 

[Wayners]

Dig out bad knots or problem areas and you can use 2 pack wood filler.
Aluminium primer I used on my pine stairs as the knoting solution failed and its been fine.
Give the aluminium primer a few days to cure following spec then 2 coats of acrylic primer.
Aluminium primer is gray unfortunately.
That's the best.

Next best is a shellac paint like Zinsser BIN but it's not a sure thing