Primer Undercoat over Emulsion?

[Harrier23]

I will be using Leyland Primer Undercoat over some bare pine picture frame panelling and skirting boards which I have sanded back before applying an eggshell topcoat.
While I'm at it would there be any benefit in applying the primer undercoat over the existing emulsion on the walls to give a better finish or would that be a waste of time?

 

[Justin Passing]

WOT IMHO.
If you want a smooooooth emulsion, sand the old a bit then buy some scumble water based additive from a pro decorators. It extends the drying time of the emulsion ( or WB eggshell) so it dries flatter. Great in bathrooms with bathroom paint on good plaster. NO roller or cutting-in brush marks. A saviour in hot weather.

 

[opps]

While I'm at it would there be any benefit in applying the primer undercoat over the existing emulsion on the walls to give a better finish or would that be a waste of time?

It is not necessary.

 

[opps]

WOT IMHO.
If you want a smooooooth emulsion, sand the old a bit then buy some scumble water based additive from a pro decorators. It extends the drying time of the emulsion ( or WB eggshell) so it dries flatter. Great in bathrooms with bathroom paint on good plaster. NO roller or cutting-in brush marks. A saviour in hot weather.

Are you confusing scumble with the likes of Floetrol?

Scumble will extend a wet edge but is designed to act as a carrier for tints. Floetrol is designed to provide an extended wet edge BUT without diluting the paint.

 

[Justin Passing]

Are you confusing scumble with the likes of Floetrol?

Scumble will extend a wet edge but is designed to act as a carrier for tints. Floetrol is designed to provide an extended wet edge BUT without diluting the paint.

The stuff I used was called scumble in the deco merchant as far as I remember, but it wasn't the glaze stuff, used for "wood graining" which was some sort of spirit- soluble liquid, I think. It was like a wetting agent and only needed a small percentage so no really diluting. Floetrol looks ideal.
The effect was superb with Kitchens and Bathrooms paint- sort of emulsion with a hard skin. Made an orgasmically perfect even eggshell finish. You know, you run your fingers over it and go "ooooooh". No?

Anyway ask at a proper deco merchant, NOT B&Q , who sell something like "traditional acrylic ......" surely an oxymoron.

I had a go at fancy paint effects at one time, with flogging brush, flitch, sponges and whatnot. Can look good, but a bit of a fad. I showed someone some ragging on a raised/fielded panel cupboard door a while ago. Dilited paint, rag, about 30 seconds - woman thought I was Michaelangelo.

You reminded me to look at my French polishes - Button, Garnet, Van Dyke, Piano and the rest. All solid, now in the dustbin which is probably illegal. I used to enjoy that.

 

[opps]

Floetrol is propylene glycol based.

A mate of mine was having problems getting a decent finish with his waterbased eggshell. I recommended that he use Floetrol or XIM-Bonder. He baulked at the cost. I told him that I have some propylene glycol which I purchased years ago, and which is way cheaper. I had purchased it to see how well it compared to Floetrol and never got around to using it.

He swears that it was brilliant.

BTW, Floetrol is made by Owatrol. I have been using their Owatrol Oil in oil based paints for about 25 years. I used to specialise in hand painting naked MDF units (using oil based eggshell). The Owatrol Oil is the only product that would enable me to maintain a wet edge when painting a full sheet of MDF.

 

[opps]

BTW, I use the Leyland Trade Primer/Undercoat to prime new timber. It doesn't cover particularly well but it is a dream to sand flat. Most others that I have tried just clog the abrasives.