Yellowing gloss - what is causing this?

[LadyMacduff]

Both of these internal doors are in the hallway, side by side, painted in the same paint. However one of them needs constant repainting due to this horrible yellowing.

We don't smoke, and neither are kitchen doors, if that's relevant.

I'm at the point where i'd like to replace them this year, but I am curious to know what is causing this for future reference.

Any ideas?

It’ll be a previous coating on the door coming through - likely something oil-based or a varnish. You’ll need to strip it right back and remove whatever’s on there, then use a primer before the top coat.

Is one in direct sunlight and the other not?

But as above, most likely to be a priming issue, or, a problem with the previous coat.

round our place there are companies that will collect, strip and return doors for £50, well worth the time and effort saved.

I had my doors stripped, but the yellowing still comes through.

Are the doors pine? If so it the resin coming through, you can but sealant but often it doesn’t work. I only know this as I have painted pine white doors.

You can get a really expensive gloss paint, it is oil based.
Maybe you have used that?

I had that.

It was a reaction between an old paint and a new paint, one oil and one water based.

I bought zinster paint in screwfix (it was about forty quid I think) which is a shellac that goes on as an undercoat and prevents any old stuff from coming through in future.

That way I didn’t have the faff of stripping back what must have been multiple layers of paint.

Gloss can do this...my skirting boards turned yellow...it's worse if they get no sunlight on them. I think silk is better

Thanks everyone.

They're not particularly nice or original doors afaik, so I would like to replace them. I'm just worried about having to do the carcasses and skirting as well tbh.

@Comedycook

Gloss can do this...my skirting boards turned yellow...it's worse if they get no sunlight on them. I think silk is better

This. I just noticed the door in the DDs room is yellowing, but only where their dressing gowns are hung.

Everyone I know says their gloss skirting boards turn yellow overtime. it's only when you paint it white that you suddenly realise again.

I had this problem almost two years ago. After a bit of googling I found that due to a change in EU regs companies changed the formula for oil based gloss paints which means that unless white gloss is in bright sunlight it will tend to go yellow. Unfortunately, I'd painted all the whitework in an internal hall with no direct light. The advice I got was to repaint in a water based gloss. I did this and the new paint has lasted much better, but perhaps doesn't have quite as nice a finish as traditional oil based gloss.

I'm just about to tackle ours! Decorator told me it was due to lack of sunlight, which is supported by the fact the worst affected area is the cloakroom which has no windows.
It was a new build when we bought, so I can't imagine it's anything underneath causing it.
I'm considering using a slight colour, maybe a tint of my wall colour, so it's not an issue again?

Oil based gloss yellows.

You would need to strip and repaint in water based paint - eggshell is nice - to prevent the yellowing

@applesandpears33

I had this problem almost two years ago. After a bit of googling I found that due to a change in EU regs companies changed the formula for oil based gloss paints which means that unless white gloss is in bright sunlight it will tend to go yellow. Unfortunately, I'd painted all the whitework in an internal hall with no direct light. The advice I got was to repaint in a water based gloss. I did this and the new paint has lasted much better, but perhaps doesn't have quite as nice a finish as traditional oil based gloss.

We had this problem too and were told the same by Dulux when we enquired. They did give us a voucher for more paint but we'd just moved in and decorated, so we didn't want to do it all again

And yes as PPs say, yellowing will be worse where there’s no direct sunlight hitting it

Would the need to strip be true if using a darker, coloured gloss over the top?

Oil based paints will yellow over time especially where there isn’t light. Using water based avoids this.

However, the OP’s picture doesn’t look like this kind of yellowing but much more like something coming through the paint from underneath.

Eggshell doesn't yellow as much as gloss. I would redo in eggshell before you get new doors

The zinster stuff lets you paint whatever you want over dishy paint without having to strip it back. It’s thin so it goes a long way. Defo worth it for less hassle. Just paint your eggshell or whatever over the top.

Use Satin Wood. If I remember right, it's the oil in the gloss that makes it yellow. Satin Wood is water based so washes out of your brushes too :)

Looks like they were varnished before and it’s come thru.. happened to me but I just kept giving them another coat and now it doesn’t come back thru
also don’t use oil based gloss.. you need to use wilkos own gloss it’s water based and doesn’t go yellow
you will never look back, I’ve not painted my whites for years and years and when I wipe them they look like they just been glossed :)

Zinster. Brilliant stuff