Oil paint over acrylic primer?

[anonymous-user]

Externally is this OK?

[trev540]

yes should be if the timber was prepared properly before priming and don't believe the cr*p about self knotting especially if it was a cheap type brand of primer.

[anonymous-user]

trev540 said:

yes should be if the timber was prepared properly before priming and don't believe the cr*p about self knotting especially if it was a cheap type brand of primer.

Thanks for that - I've scoured the Dulux/Crown data and specs and there's no info at all. You have to dig deep to find if some paints are even water or oil based and as for what can go onto what it's non existent! Not water onto oil is an old no-no but the other way round I wasn't too sure about. The paint manufacturers really need to get a handle on it and make it simple or there'll be some disasters.
I've primed up and glazed new wood windows so I'll start to coat them up tomorrow

I've knotted skirtings with a bit of emulsion that seems to work fine!

Edited by V6Pushfit on Saturday 13th February 20:38

[bennno]

V6Pushfit said:

You have to dig deep to find if some paints are even water or oil based

Or you could just check if it says the brushes can be cleaned in water, if so its water based

[anonymous-user]

bennno said:

Or you could just check if it says the brushes can be cleaned in water, if so its water based

Yes that what I was doing, trying to relate top coat solvent with primer solvent to find a water primer with recommended oil top coat, or oil primer with water top.
Websites no info, literature no info, and tins very confusing as I mentioned earlier.
Earlier yesterday I emailed Dulux on the email on the website but got a reply saying the email address was an interior design company and they can't answer the question ! I suspect 'amazingspacedesign.co.uk' aren't actually Dulux.

It seems to me Dulux need a bit of sort out if seems a right mess

[trev540]

Try the dulux trade website or go to a proper decorators merchants and ask for their advice. Try a Brewers, Crown decorator center if you have one in your area not B+Q or Homebase etc

[ZP]

Water based primer under oil paint is ok, but you may find the longevity somewhat lacking externally.

Since ICI sold Dulux to Akzo Nobel the quality of the paint, technical, and stores has gone downhill.

[anonymous-user]

ZP said:

Water based primer under oil paint is ok, but you may find the longevity somewhat lacking externally.

Since ICI sold Dulux to Akzo Nobel the quality of the paint, technical, and stores has gone downhill.

Thanks for that. I thought Akzo Nobel were streets ahead of Dulux. The Rubbol DSA onto Onol Primer was THE top microporous paint - brilliant stuff. I wonder if it's all gone pear shaped then.

[ZP]

The Sikkens stuff is brilliant - I use it externally where possible and on my own exterior - but for some reason just about all the Dulux products have taken a backward step in quality.
I've been using Dulux almost exclusively for the last 20 years and since last September have switched to Johnstones - I'm finding the quality of paint better, the technical support better and far better service from my local store.

To be honest, I'd rather use Farrow & Ball or Little Greene paint than Dulux now...

[GBX]

Is there any truth in the story that it's necessary to use the same brand of base and top to avoid mottling/yellowing? Aside from the yellowing as a result of the EU changes to formulation.

[ZP]

Different brands shouldn't make any difference to yellowing - all the 'good' stuff has been taken out irrespective of manufacturer.
What you will notice though, is if using the Dulux water based undercoat and gloss, the undercoat has a slight sheen to it to aid the glossiness of the top coat - not all manufacturers do this.
So in that respect, its best to use the 2 tin process from Dulux for the best finish.

Externally, whilst paint is getting better, the environment is getting worse.
We have hotter temps, acid rain and stronger UV - all makes a massive difference to the longevity of exterior paint and I think manufacturers are struggling to keep up.

I started painting in 1985 and there was no such thing as real exterior paint - normal gloss and undercoat was generally used, but it lasted.
But back in those days we were allowed to spray creosote on fences, could buy leaded paint off the shelf and paint pub toilets with solvent gloss - ceilings, walls, woodwork, the lot!
A day of those fumes was like having 6 pints....we struggled to drive home afterwards

I've just had a long conversation with my Dulux rep regarding the quality issues - it appears theres a few more products in the pipeline that address the issues.

[anonymous-user]

Dulux have confirmed solvent OK on water primer. They weren't aware the tins have no indication at all what to use on what and no guidelines or spec - they said they would flag it up to be amended.
In fact the water top coats have no warning not to use on oil primers, and you have to look at the brush washing instructions to have a fighting chance to know if the paint is oil/water based - how does Joe Public stand a chance??
Incredible.
They seem to be keen to punt out paint with brochures all about fancy interiors with many pages wasted on crap photos with fk all about the detail.

[Wozy68]

V6Pushfit said:

Externally is this OK?

IMO no ......... We did this 18 months ago on all our exterior wooden windows at home, the paint has since cracked.

We used a water based primer and then Little Green mixed oil based exterior colour as they were the only company we could find that did an exterior oiled based eggshell finish rather than satin, gloss etc. Biggo mistake, not sure now what we can do to correct it.

[ZP]

Remove the paint.
Only problem is that you'll struggle to get the WB primer off, whether with heat or chemical.
It's a bit of a bd to shift!

If it was me, I'd be using heat and sanding - laborious and messy, but the only way imo.
Then re-coat with oil primer.