Four years ago I built a large wooden entranceway and screen door installation at a big summer place, but I forgot one crucial thing that has since led to trouble. If you need to stir your varnish (as in a semi-gloss that has solids at the bottom of the can), stir it several hours before you start to varnish so that any bubbles you may create have had a chance to dissipate. You’ll know you’re finished when the oil no longer sinks in. Don’t forget to put tung oil on the back side too, or the wood can absorb humidity and you may see some cupping or much greater movement.
Also, excess thinning can lead to solvent entrapment under the surface dried varnish and later bleed back into the varnish attacking it. Follow the manufactures directions on thinning they really want you to have good results with their product and they will not steer you wrong. An excellent spar varnish is McCloskey Man ‘ War Marine Spar Varnish It contains tung oil and polyurethanes, which combine to form long chain molecules, called polymers. I would like to put spar varnish on it but I cannot do a lot of sanding on the veneer. First, you need to prepare the surface properly by completely removing the finish and any sun-damaged wood.
Sometimes offered as 2 part finishes, Polyurethane is used for hardwood floors (do you remember the roller skater on the living room floor ads?). Avoid bubbles (produced by jabbing or squeezing the brush) and gently stir in thinner with a clean wooden stick. I just tried Googling that and couldn’t find anything about using marine spar varnish over paint.
If the boat moves (plank on planknot through the water!) by which I mean any old clinker or carvel boat then you really have to use traditional varnishes, but if the wood is stable, as in most glued and moulded boats then you can use either traditional or modern varnishes. This dreaded syndrome is the single factor responsible for more fouled up varnish jobs than anything else.
Before applying the varnish, I lightly sanded the table because the first coat of varnish had raised the grain a little all over the table. Thick coats of varnish take longer to dry, and they tend to crack as the varnish ages. I need some advice as to how to procede with a spar varnish product to provide a protective finish. Increasing the wax content of a varnish can reduce gloss and was used as a flatting agent.
It is fair to say that most varnished floors will mark if it has furniture moved about on it, heavy shoes, heels and large dogs are all things that can contribute to damaging varnished floors but that said adding and extra coat or two can increase the durability of the varnish. Holding the brush at a slight angle to the surface, very lightly stroke the surface of the varnish to remove brush marks and even the surface.
Here at Classic Craft we continuously test varnish in the outdoor enviroment to see how well they are holding up. We compare our own tests with testing done by others, such as the Practical Sailor Periodical, to verify that we are using and recommending the finest finishes available. Unlike varnish, which is somewhat permeable, epoxy completely seals the underlying wood. In a pinch, you can dampen a rag with mineral spirits or alcohol and rub the wood down.
Although Floor varnish is generally thought of as a clear product, there are in fact a wide range of pigmented versions such as Ronseal Diamond Hard Coloured Floor Varnish , which comes in six attractive natural wood shades, to produce a remarkably hard-wearing, satin varnish sheen. Linseed oil (pressed from flax seeds) is a drying oil that has been used for centuries to coat wood and stone and, with pigments, make paint. Varnish is not a fixed formula and through the ages various components have been added to improve certain characteristics of a varnish such as hardness, speed of drying and cure, elasticity, colour or UV protection.
Without care and maintenance, the finish eventually becomes brittle, develops severe cracks and then peels, while the wood underneath the finish darkens and cracks. The solvents, which allow the resins to be fluid, evaporate once the finish is applied and leave the resin to set up a film on the wood. My suggestion to you would be to contact Epifanes directly to inquire about your question and depending on the answer then apply varnish over a small section of your boat. After laying on an even coat of varnish in strips along the grain of the wood, apply more varnish in even strokes across the grain of the wood to level and even the surface.