It's the go-to material for any exterior woodwork that needs a clear finish, but because its high resin content gives it a yellowish hue, it isn't the best choice for interior furniture. Brushing and wiping with different techniques. You can apply the first coat full strength or thinned up to half with paint thinner, making, in effect, a wiping varnish. What kind of brush do you use for oil based stain? The idea is to remove dust bumps and create a rough surface a new coat can stick to. And if you use it for very long, the foam head begins to wear out and get floppy. How to Apply Spar Urethane. Tip 6: Use wipe on poly for small or tight areas. Adding between 5-10 percent mineral spirits will help to make the spar varnish flow off the brush more smoothly. 400 grit is too fine to get rid of brush marks. I followed that advice on a dining room table I recently purchased at a consignment shop. Do not return the thinned varnish to the original container after use. Wondering if I could use one of those 6" wide foam rollers, with a tight foam insert. SilverTip Hardener. of OLD MASTERS MARINE SPAR VARNISH, high gloss. SilverTip Epoxy. I can see brush strokes from the paint pad and even some heavy buildup areas. There are drawbacks to lacquer however. If the varnish is not labeled “polyurethane” or “spar,” it is probably alkyd … Brushing is only going to give you the same problem. Note: brushing lacquer sprays on perfectly well! Sand down the brush marks lightly with the fine-grit sandpaper. Tip 1: Sand out pencil marks. Tip 2: Maintain a clean work area. Besides having a great name right out of the 1950s, this is tough stuff and is used on floors. I applied this with an 8" pad about 2 months ago and was pretty pleased with the result. Apply the polyurethane finish lightly to the brush, making sure to wipe off any extra. Can you polish spar urethane? Avoid compounds that contain silicone. VALUE GUIDE: Varnish Alternatives PRODUCT PRICE INITIAL RATINGS Minwax In/Outdoor Helmsman Spar Urethane $17/ quart Excellent Pettit Bak V-Spar 2053 N/A Excellent Pettit Z-Spar 2015 Flagship $30/ quart Excellent Pettit Z-Spar Captain's 1015 Traditional Amber $28/ quart Good. It will work but polyurethane is much better for interior applications. My question is about thinning this product. Well first off spar urethane is not the right thing to use on indoor furniture because it dries quite slowly and doesn’t dry as hard as the regular polyurethane. Bumps are bumps and need to be physically removed. Don't use rollers or foam brushes—they create bubbles. SPAR URETHANE Form: GDH-465 Rev. According to Minwax, their Helmsman Spar Urethane may cause mild yellowing over light wood finishes, but their Water Based Helmsman Spar Urethane is supposed to be crystal clear and will not yellow. Brushing onto 5/16" knotty pine V-joint on interior of outdoor shed. This method should be used if you are applying a small amount of polyurethane in a small area. While it is true that spar varnishes are long oil (vs. short oil) and thus remain somewhat flexible, they can reliably be rubbed out. Applied 6 coats of Minwax water based Clear Satin Spar Urethane-then the last coat is-one coat of water based Clear Gloss Spar Urethane. To avoid bubbles when brushing polyurethane, you have to work slowly and precisely in order to ensure a smooth and even surface. I do bathtub and countertop refinishing using epoxies and urethane mixes. Next day some white marks appeared on the table. Perhaps a rubbing compound? Ground shipments generally do not have additional hazard charges. However, you might want to sand lightly before the final coat just to make sure the last coat goes on smoothly. Polyurethane is easily applied with a paint brush or roller and dries quickly. Then I would use 3M Imperial Microfinshing compound followed by Finesse-It III, both on buffing pads. Then, apply a thin coat of spar urethane using a good quality brush with a natural bristle. ... Budget-Friendly: MINWAX Helmsman Spar Urethane Aerosol. I avoided brush marks, but after the first coat, I get a feeling it's gonna take a 4 or 5 coats - the first was very thin! Wipe the surface with a damp, lint-free cloth or sponge. Spar varnish is an example. How to Seal Birdhouses. Bubbles in Fresh Finish Two axioms for furniture finishers are that you shouldn't shake the can before applying polyurethane and you shouldn't wipe the brush along the side of the can. It is the most accurate method as you can control exactly where the polyurethane goes. - posted in ATM, Optics and DIY Forum: Im not necessarily a fine woodworker but Im building a new base for my LB16. It is softer and more elastic then Parks. Brush. Spar varnish, also called marine varnish, is a tough formula used for boats and exterior jobs. Once it is clean and the surface is uniform, wipe it with a damp cloth to remove dust. How hot is it when you are applying the spar. Touch the brush at one corner, and draw it straightly in the direction. Waited 24 hours before placing the spar urethane. It looks really nice and smooth and glossy and by chance it only has just very few small nibs on the surface. Varnish does not melt into the previous coat. The surface to be varnished must be clean and dry, and the ambient temperature should be above 50 degrees Fahrenheit. It is made from the dried secretions of the female Lac beetle. I'm planning to put on 3 coats of spar urethane, that's a lot of finishing, even with a wide foam brush. Tip 5: Finish both sides at once. One of the best qualities of spar urethane is the UV blockers that enable it to prevent wear, fading, or yellowing of the surface as time goes by. Sanding plays an important role in applying urethane. Yes, you can use a paint roller to apply polyurethane. Spar urethane, of which Minwax Helmsman is a leading brand, is spar varnish that includes urethane plastic as one of its resins. Each method presents you with some unique benefits and drawbacks. After finishing one line, move next and proceed to do another line of it. Applying it can be done by spraying or brushing it into place. November 3, 2020. For example, one salad bowl finish recommends three days of curing after the final finishing step; one brushing lacquer calls for seven days of curing before normal use. Spar urethane should be applied using a bristled brush because of its thicker consistency. If you are brushing spar urethane onto a piece of furniture, be aware that you may leave behind brush strokes. April 6, 2007 : Avoiding Bubbles with Spar Varnish ... April 6, 2007. What are the names of Santa's 12 reindeers? Besides, what kind of brush do you use for polyurethane? Last but not least, every spar varnish needs to protect itself and the underlying wood from the sun. If your table is for outdoor use a spar varnish is best. Let’s start with the basics first and then see how you can safely use spar urethane to access all its advantages. If I recall, it isn't even varnish anymore, but a … Spar urethane is applied to a surface with a household paintbrush. You probably need 180 grit wet and dry paper and sand it with water as a lubricant. If the poly is water-based and too thick, thin it by adding water (no more than 10 percent). However, polyurethane dries slower compared to spar urethane which means that it takes longer for the application to fully adhere to the surface. This is finite work and when a customer requested we do some doors, I accepted the challenge and moved forward thinking “I already do finite refinishing so I can do this with just another product” – boy was I wrong, lol. 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