I will also consider trying another company's varnish next time. If that happens, I remove the sealing disc up inside the inner cap. Push-and-turn doesn't seem to work for oils and resin. Bought a Grumbacher Copal Medium at a thrift store today for $1.99! There is a real risk of injury from the force of trying to open those bottles, plus the temptation is to disable the locking top (which I did) or decant the product into a jam jar or similar, defeating the whole object. Breaking and discarding the outer cap means you can then open the inner cap with pipe grips or pliers even when it's gummed up, and for adults that seems safer than trying to apply force in two directions. But normally, now, I pour the contents of a new bottle into an old jam jar. It opened first time (after days of trying by hand only!!) It worked- I couldn't get the lid off one oldish bottle of varnish, so I optimistically bought another. Or thinning oil paint on the canvas. I bought the varnish spray bottle. I placed the bottle lid end under the hot water tap for 30 seconds and off it came with little effort. It may work with a large pair of pliers although not tried yet. Anyway the upshot is that Marla Morrison,     ustechhelp@winsornewton.com    will give you a replacement if you contact her, or she says that if you return the bottle to the place where purchased it will be replaced. LOL Fortunately there is a nice metal screw cap under that plastic cap. This linseed oil improves flow, increases transparency and adds to other oils to speed drying. The flat screwdriver worked. This icon indicates that this is the lowest possible price offered for an Basic, but necessary, Linseed Oil for mixing oil paints on a pallet. In the end I lost my temper and bashed the top of the inner one in with a screwdriver. In the UK at least, that includes Daler-Rowney and Roberson, not to mention L. Cornelissen in London. Who woulda thunk! I used garden snip to get between the can and lid and cut a few pieces until I was able to pry it off. Interesting thing i have tryed to put Liquin to different bottles but it get dried, hence i can't even change the bottle. Winsor & Newton Drying Linseed Oil is darker than Refined Linseed Oil and promotes the fastest drying rate of all the oils, while increasing gloss. Great post,thanks. This breaks the product but you can then twist off the transparent plastic inner cap in the normal fashion. We'll be cleaning the threads before we put the cap back on. Basic, but necessary, Linseed Oil for mixing oil paints on a pallet. My husband finally used needle nose pliers and voila!!! Placed the bottle on the counter, took out my Drimmel, and drilled a little hole in the top. Now I can just put the outer one on over the hole. Thanks for this. Imprint of the lid on my hand (well, both hands.) TY TY! Winsor & Newton Artisan Water-Mixable Oil Paint has the brilliant colour and buttery consistency of a regular oil paint, without the need for hazardous solvents. i guess it loosened the gum. Winsor & Newton Artisan Water Mixable Linseed Oil SDS Product Disclaimer: Officeworks cares greatly about the safety of our customers and makes every effort to ensure that the images, descriptions and formulations of each product we sell are accurate and up to date. Read honest and unbiased product reviews from our users. The childproof caps we are talking about require two dissimilar motions for opening: press down and turn. OMG this *&^%$#":}+:? The key difference between Artisan and conventional oils is its ability to thin and clean up with water. Seems I am one of many with the same issue. Glad I found this before I ripped my shoulder out. What a shame! Thank you my hands are so sore from trying to open a stupid bottle of oil. I am going to try the screwdriver method and will avoid W&N screw top containers in favour of other manufacturers. That also remained inviolate, despite my efforts and naughty words, until I found this site. I cut my finger so badly I had to get stitches. You think they would have fixed by now. Basic, but necessary, Linseed Oil for mixing oil paints on a pallet. Just taken bus into town, needed fixative for pastel work before I can continue further. Your screwdriver trick worked magic in about 2 seconds. Thanks RAB! Linseed Oil for Artisan Water Mixable Oil WINSOR & NEWTON - 75ml Bottle. Oh gosh....you came to my rescue. The method above is what I've used as an adult and a child might then be able to open the bottle; it must obviously be kept in a safe place where it is not accessible to children (as is the case with, for example, tubes of paint which do not have childproof caps but contain pigments that may be more hazardous than oils, mediums, solvents etc). Of course it might then mean a child can open the bottle (assuming the cap is not gummed on) so it must be kept somewhere safe. so glad am not the only one. This is ridiculous and my hands and arms hurt without any success yet. No luck but I have burst a blood vessel in my finger! Thank you, I agree with all of the above. There is 75 mL of oil in this bottle. Improves flow, increases gloss and transparency. Darker than refined Linseed Oil, this oil promotes the fastest drying rate of all the oils, whilst increasing gloss.Improves flow.Increases gloss and transparency.Add to other oils to speed drying.