Pre and post 2010 paints

I have several part tins of white gloss paint some as the title suggests are pre 2010 and some are post 2010. Reading on here about the changes made to paints and subsequent yellowing of newer paints I want to end up with something uniform. I'm not too bothered about the yellowing but I'd rather not have one white and one yellow window for example.
Having a fair amount of painting to do around my parents house and being on the tight side I'd rather not scrap perfectly good paint just to buy more so the question is simply - can I just mix pre and post 2010 paints together?
Oh yes they are all oil based.

You could try it, but I wouldn't. For a start, the formulae of oil based trim paints have changed (the solvents are different, for a start) and you don't know whether they will combine properly. They might, or they might not, in which case you'll have wasted both tins.

You could try combining small quantities, I suppose, to see if it works. But I doubt you'll find a professional decorator who's done that. Most of us are abandoning oil based trim paints for interior work now in favour of acrylic/ water based ones which don't yellow.

emilybronte said:

Most of us are abandoning oil based trim paints for interior work now in favour of acrylic/ water based ones which don't yellow.

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Some of us will regret the passing of good old spirit based paint !!!

I would not try mixing the paints if they were of a different age. If you must make use of them, the pre 2010 tins I would use on woodwork with plenty of light, maybe like window sills upstairs or something. If you have the later paint with the blue lids, then use them downstairs. They were the of the new paint mix that were supposed not to yellow, although there have been mixed results in feedback from fellow decs.

To be honest, Dulux, ICI, risk a big problem if they were still making a botch job with oil based white paint. I have had ok results, but I am still waiting long term to when I go back to jobs later on.

Thanks both for your replies. It seems that I may have to bite the bullet so to speak and buy some new paint. The largest area I have to repaint is the outside of a wooden veranda some 8ft by 12ft which is is why I was hoping to be able to mix the paints . As it is I will the part tins seperately on other parts of the house (in truth the whole house needs redecorating inside and out).
Another question then seeing as it's likely I'm going to be buying more paint. Is there any real difference in performance nowadays between oil and water based paints if used externally?

ladylola said:

Another question then seeing as it's likely I'm going to be buying more paint. Is there any real difference in performance nowadays between oil and water based paints if used externally?

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Oil based is fine outside as the UV light prevents it yellowing. It's just inside that it is a problem.

Johnstones claim their water based acrylic gloss can be used externally.

Thanks for the information about the UV. It's not something that I knew and may work to my advantage as I could use the different paints on different faces of the veranda. Yellowing isn't something that I'm too worried about, in fact I sometimes wonder about this obession with brilliant white, but was more concerned with it looking patchy. I've got 2.5 L of linseed oil based white paint that does yellow (or should that be mellow?) as soon as your back is turned but won't be using that.
The painting I'm concerned with is going to be externally as I've got 2 gallons of magnolia eggshell for the internal decorations (that was free too )