Painting over yellowed gloss

[rreanor]

What's the best paint to paint over previously painted white oil gloss paint which has turned yellow?

I've done a few skirting boards with a sand then 2 coats of new white gloss, but I'm wondering if the yellow underneath will eventually show through.

I'm not bothered about what happens in 5 years as I'm not staying in the property that long!

 

[Chivas69]

Use an undercoat first

 

[Harry Bloomfield]

All gloss paint eventually turns yellow.

 

[JohnD]

All gloss paint eventually turns yellow.

no, oil-based gloss paint eventually turns yellow indoors, in the absence of sunlight.

We now have water-based paint.

 

[Harry Bloomfield]

no, oil-based gloss paint eventually turns yellow indoors, in the absence of sunlight.

and the difference is?

We now have water-based paint.

Which doesn't yellow, but is not as robust as oil based paints.

 

[JohnD]

probably not

but adequate for indoor work.

 

[Chivas69]

And it's awful stuff

 

[opps]

All gloss paint eventually turns yellow.

Only oil based gloss if there is a lack of sunlight (read UV light).

I not a fan of waterbased finishes. They are less durable and don't flow as well as their oil based counterparts but they do have other advantages.

Unfortunately, the more stable/reliable finishes often tend to be spray finishes, eg acid cat or cellulose/poly etc. Acid cat, is lovely to apply but really bad for your lungs because of the isocyanates.

 

[redhexagonal]

no, oil-based gloss paint eventually turns yellow indoors, in the absence of sunlight.

We now have water-based paint.

I have yellowed gloss everywhere. I was going to paint over with mid grey satinwood. Would that change colour too?

 

[sparkwright]

I have yellowed gloss everywhere. I was going to paint over with mid grey satinwood. Would that change colour too?

Not very noticeably, if at all.

 

[opps]

I have yellowed gloss everywhere. I was going to paint over with mid grey satinwood. Would that change colour too?

As above, it will change colour but only very, very slightly.

White gloss tends to yellow much, much more than white eggshell or satinwood.

In 2010 the VOC regulations resulted in paint manufacturers having to reduce the solvent levels in oil based paints. The earliest formulations were horrible to work with and yellowed in weeks. They also took ages to cure. I recall my first job on Jan 3rd, 2010- the oil based eggshell was still tacky the next day. From that point onwards I all ways add Terebene (oxidising agent) to speed up curing times. Additionally I add Owatrol and white spirits. It took a couple of years for them to reformulate the paints so that they didn't yellow so quickly.