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https://www.askthetrades.co.uk/cgi-bin/yabb/YaBB.pl DIY Forum >> Painting, Decorating & Tiling Questions >> Undercoat https://www.askthetrades.co.uk/cgi-bin/yabb/YaBB.pl?num=1174511017 Message started by Bob on Mar 21^st, 2007, 9:03pm

Title: Undercoat
Post by Bob on Mar 21^st, 2007, 9:03pm

I've been advised to paint my new skirting boards in acryllic primer after knotting them. Although I didn't get a reason as to why. What are the advantages of primer over normal undercoat :-?

Title: Re: Undercoat
Post by hamilton on Mar 21^st, 2007, 9:43pm

Bob, see the thread underneath this one,'emulsion as wood undercoat.'

Title: Re: Undercoat
Post by Bob on Mar 22^nd, 2007, 9:26pm

Typical I read it before the 18th so missed the last 3 posts.
So just to make sure I'm understanding correctly, acryllic primer needs no undercoat on it before top coat (Gloss) :-/

Title: Re: Undercoat
Post by hamilton on Mar 22^nd, 2007, 11:28pm

Acrylic primer is a primer/undercoat, so the theory is you put one coat on as a primer and another as an undercoat, then gloss it.

Me, I would apply a coat of shellac knotting to the knots followed by a coat of oil based primer. On top of this I would use an oil based undercoat and then an oil based gloss coat.

The very least I would do if I had to use acrylic is one coat of acrylic primer, one coat of oil based u/c and one coat of oil based gloss.
Acrylic being water based raises the grain of the wood and does not flow out very well, so leaves more brush marks than an oil based paint.
Leave the acrylic to the builders who need to slap some paint on and go home to watch Richard and Judy.

Title: Re: Undercoat
Post by JerryD on Mar 22^nd, 2007, 11:57pm

Ready Steady Cook actually

Title: Re: Undercoat
Post by Bob on Mar 23^rd, 2007, 9:18am

Gotya. Thanks very much. I'll be off to the shops then. ;D

While on the primer subject I've got to fireproof a metal beam, I've got some intumescent paint which say's use a good quality primer. Any recommendations for a 'good quality' primer that the average Joe can buy. From Gibbs & Dandy, Travis Perkins or even Screwfix preferably.