If you want the smoothest finish possible, then wait until it is dry, very lightly sand with very fine paper (220 or finer) to remove any dust bumps, wipe it clean with a slightly damp cloth or tact rag, let it dry or buff it dry with a dry cloth, then apply the next coat. For high-gloss varnish, polyurethane, and lacquer finishes, wet sand with P600 or P800. I have been using 220 paper inbetween coats of varnish. Take care when abrading between multiple sealer and finish coats. Varnish is a clear finish that hardens and cures on the surface of wood. An existing varnish … I have found that, when sanding between the later coats, one can sand with wet and dry paper used wet, and get away with sanding a little sooner than if you were sanding dry. A sharp corner makes for the thinnest film build and is really easy to break through when sanding for the next coat 6] The first coat is usually thinned a little to make it flow better and sink in 7] After the 120 coat you can wet sand if you wish, tends to give a finer finish, … Steps to Sanding & Varnishing Wood. A spar urethane finish is applied to many different wood features, interior and exterior. Polyurethane dries slowly, so there are always dust nibs that should be sanded out before the next coat is applied. What are the different types of varnishes? Varnish is a clear finish that hardens and cures on the surface of wood. Steps to Sanding & Varnishing Wood. Maple's density and light color can make screen marks, sandpaper lines or swirls obvious. To create a good resistant finish, multiple coats of the polyurethane may be required on the wood surface. Polyurethane is a type of varnish with a resin that adds heat-, scratch-, water- and solvent resistance to the wood on which it's applied. You can add additional coats later, but for complete protection you need at least six. A coating of varnish remains fairly uniform on top of this landscape, so a thorough sanding between coats knocks the tops off the "mountains" while allowing the "valleys" to become filled with varnish. Take in mind that the first coating should be thinned 50% with mineral spirits – this is to allow better diffusion, then followed by a total of 2 full strength, and make sure to execute the sanding between coats.
Polyurethane is the modern product most often used as varnish, or clear finish, on stained and painted wood surfaces. Sand lightly and carefully. If you are scuffing between coats of paint or sealer, choose something between P180 and P220. You need not sand between the first three coats (if your applications are within the recoat time), but all subsequent coats require sanding. The normal rule of thumb is that a sanding sponge is 3X the grit of its stated P value. Also, sanding between coats of deck stain or wood stain is required …
I have two coats on the boat and many more to go, and it seems these pads( medium) would be ok. My spars are Douglas fir and the have high places that the 220 seams to clean off. Mixing Mix base and curing agent thoroughly at the specified ratio. Answer: Manufacturers publish a theoretical “dry time” based on a predetermined temperature and humidity level. When you apply several coats of urethane, you need to sand between each coat to help the next coat stick. You can also sand out brush strokes and bubbles. P150 sponges are about perfect for sanding between coats. Spar varnish is also a soft finish, which makes it difficult to rub out. My question is it allright to use scotch brite pads for this inbetween sanding? I am using easypoxy hi build varnish from pettit. Until now, only synthetic finishes mimicking the appearance of varnish allowed multiple coats without sanding. Question: For sanding purposes, what is the effective drying or “cure” time in between coats of varnish or does it vary depending on the relative temperature? Sanding Between Coats. After a couple of coats, depending on your expertise with a brush or the amount of dust and dirt in the air, you may want to sand the surface lightly to get rid of the inevitable bits that seem to fall into the surface.

One caveat: Sanding an oil finish wet (or even sanding dry between coats) is risky if you have stained the wood. Therefore a P150 sponge is the equivalent of P400 sandpaper. 220 – 320 paper should be used for this. Between coats. How Long Do You Let Polyurethane Cure Before Wet Sanding?. If you want a varnish-like finish then you can gently rub the surface down with an 3M abrasive pad and wipe down with 216 before applying the final coat of Marine Gloss.

No matter whether sandpaper strips or screens are used, it is the sharpness of these materials that causes marks, even in fine grades such as 150 or 180 grits. Spar varnish, in general, protects the wood from getting damaged or discolored due to water, heat, UV rays, stain, and solvent. The weather and atmospheric conditions to which the finish is subjected will determine the amount of time between coats.


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