The simple process of oiling out is often touted as a safe alternative to applying retouch varnish in areas of dried oil paint films that have sunken in. And the process is safe and straightforward.
Varnish will seal and protect the wood surface better than oil. But oil is easier to use. Thing is, if you start out with varnish, you'll have to re varnish over time. But if you start out with oil, if later on you decide to varnish, it might not stick to the wood.
The shine obtained with a wood oil is much softer and more natural than that of a varnish, and the touch is silky and very pleasant. So the best way to polish unvarnished furniture is to use wood oil.
Can you oil out a painting after it's been varnished? No. If you want to treat a dull area after varnishing, you will have to remove the varnish first, and then revarnish once you've finished oiling out.
Generally oil is better . varnish only gives a surface protection and in most cases subject to uv deteriation . Oil if applied in several coats soaks into the wood and prevents the ingress of moisture and in certain timbers found naturally like cedar which lasts well open to the environment .
Oil is one of the most popular ways to finish wood thanks to its ability to replenishing the natural oils that you find in the wood, plus it provides added oils to improve its performance. Wood oil can be used on both interior & exterior wood in the form of furniture, decking and floors, to name a few.
After oiling out, wait until the surface is thoroughly dry before varnishing, which usually takes several days to a week or more.
When using retouch varnish, a thin layer of removable varnish is put in the middle of the structure. When "oiling out," a thin layer of binder is put between other layers of binder, and before long, this all cross-links to become one homogeneous layer.
We recommend using colorless matte interior oil to preserve its natural look, but you can use oil with stains if you prefer. Tip: apply the oil to the pieces separately and assemble the furniture once the process is finished.
Polyurethane works better on wooden surfaces that are indoors. While varnish is durable and inexpensive, it's best suited for softer woods. Polyurethane dries quicker and requires fewer coats but won't hold up in the outdoors. You'll need to use personal protective equipment when applying both products.
One of the most popular ways to make wood flooring shine without varnish or wax is to use a clear, matte sealant. This can be applied with a fresh microfiber cloth, which will help erase any scuffs and light scratches.
Linseed and Tung Oil
Linseed Oil and Tung Oil are the traditional natural finishing oils for wood. These are the two toughest natural oil finishes, with tung oil being the toughest. Both are great for wood floors.
Olive oil is the perfect eco friendly finishing touch for wood if you want to keep it looking natural, earth friendly and easy to maintain. Olive oil usually turns a piece of wood a dark warm colour with a slight sheen to it, it's the perfect treatment if you are hoping to use a piece in the kitchen around food.
Tung oil is the harder of the two and the one most often used on its own, while linseed oil is a common base for paints and varnishes.
Oils protect by permeating the wood deeply, while varnishes work by forming a layer on the wood. Oil can be ideal for wood that gets wet frequently. Products like Biofa Ireland's non-toxic Weather Protection Oil or oil-based Exterior Wood Glaze/Varnish prevent water ingress and keep the wood protected.
Instead of varnish, some artists use acrylic mediums like acrylic gel medium or matte medium to seal canvas paintings. These mediums provide protection and can be mixed with paint for added texture or effects.
Oiling out before varnishing is 100% bad practice. Earth pigments can have a tendency to sink in, but adding a very small amount of stand oil can go a long way towards preventing this. All that said, if you're at the point of varnishing then wait the 6mos-1yr and varnish carefully and as thinly as possible.
Oiling out can be done with linseed oil mixed with solvents, such as mineral spirits or turpentine, and applied in very thin layers. Many artists have had excellent results using Oleogel to oil out paint layers by rubbing a small amount into the paint surface with a finger.
An oiled worktop should ideally be sanded with high grit, to provide a base for better adhesion with the varnish. And as wood oils tend to penetrate deep into the wood grain, they may prevent the varnish from forming a good adhesion with the surface.
In the Mason jar, mix equal parts boiled linseed oil, oil-based polyurethane, and mineral spirits (the amounts don't matter, as long as it's all equal parts, I try to only make as much as my project needs so I'm not having to store jars of unused furniture finish). Stir well with a stirring stick.