You need to replace the onion every day, but it does help, don't know why.
I remember an old painter back in the seventies who told me he would put a splash of the customers favourite perfume/aftershave in the gloss, he swore that it worked, never tried it myself.
One of the first jobs I undertook working for myself ('several' moons ago) was re-painting the local chip shop/cafe in the nights/weekend when they were closed. (The owners were too tight-fisted to close for redecoration!) The whole ceiling was wood panelling, as were all of the shelves. I used a paint additive called Paint Petal to mix in with the gloss and it made the whole shop smell of flowers. I was told that even the customers commented on the nice aroma.
I used it on a few occasions afterwards but then it seemed to go off the market - no idea why. I do recall seeing something similar on ebay a few years back so maybe you could have a look around online for something similar.
The onion trick is said to work by many people, but I never noticed any difference when I tried it a couple of times, and my nose then got used to the smell of oil paints so it doesn't really bother me anymore.
We can get this stuff here in the US but not sure if anything similar is available back in the UK.
https://www.rustoleum.com/product-c...us-additives/paint-plus-paint-additive-scents
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