Hello,
I was reading some old posts about waterproofing plywood. The advice was to paint the edges with metal primer. Why should you use a metal primer rather than a wood primer?
Which metal primer should I use? In my local shed there are: metal primer for ferrous metal, metal primer for rusty ferrous metal, special primer for non-ferrous metal, and red oxide primer. What's the last one for?
I also found an aluminium primer which counter-intuitively is not for aluminium but for wood. Is it so called because it contains aluminium? I read that it stops knots showing. I might buy this next time because if it saves having to do a separate application of knotting solution, hopefully this will speed things along.
Thanks.