what coating to use on stained exterior door to protect it from moisture
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How to choose and utilize a long-lasting clear cease.
What practise fancy wooden boats and beautiful wooden front doors have in mutual? They both need a articulate end that can really stand up to the elements. Sunlight, water, extreme temperature changes and abrasions are leap to occur in both situations. Most clear coatings but tin't have that type of corruption and will fail in a twelvemonth or ii, allowing discoloration and damage to the wood.
Clear outside varnishes
1. Saturate the raw surface with distilled h2o to eliminate a possible catastrophe. Wet (from rain or wet fingerprints, for instance) that inadvertently gets on the surface leaves invisible marks that show up equally ugly splotches when stain is practical.
Spar varnishes are formulated to exist resilient under outdoor conditions. They're more rubberband than regular varnish, and then they're less probable to crack as the wood continuously expands and contracts with changing outdoor weather. Some spar varnishes too contain very constructive UV inhibitors. The finishes with the best runway record for exterior use come from the marine industry, where spar varnish originated.
1B.
Spar varnishes are normally glossy. A glossy sheen looks skilful on a wooden boat and also tells the owner when it'south time to utilise a fresh coat of finish. A loss of sheen indicates that the cease is beginning to dethrone and information technology's time for recoating. Some brands offer a lower sheen choice, commonly recommended for awarding as the topcoat over several coats of high gloss for the best results.
ii. Remove factory sanding marks past carefully and thoroughly sanding with the grain by mitt, using 120 grit paper. These factory sanding marks are especially problematic on the rails, where the scratches run beyond the grain.
Well-nigh of the spar varnishes at hardware and pigment stores will piece of work well on an exterior door that'south tucked nether a front porch, where the lord's day and rain are kept at a distance. But for a door that volition be fully exposed year circular in a harsh climate, a high quality oil-based marine-grade spar varnish volition provide both good looks and a long service life before it requires maintenance.
3. Install hardwood dowels to create temporary legs for continuing the door for finishing. Fill the holes with epoxy putty later the finishing process has been completed.
Tung oil and phenolic resin are the cardinal ingredients in many marine-grade spar varnishes. The most technically advanced marine spar varnish formulations also comprise ultra violet low-cal (UV) inhibitors. UV inhibitors reduce the effect of the sun's rays by irresolute UV lite free energy to heat, which can then dissipate without harming the cease or the wood below information technology. These are expensive ingredients and are reflected in the cost. A quart of the adept stuff tin can cost $40 or more, but this is a small price to pay compared to a finish that fails later on a year or two.
4. Stabilize the standing door with additional dowels and a wall-mounted bracket, so both faces and all the edges tin can be finished at once. Blanket every surface is important for protection and is required by the manufacturers' warranties.
Unfortunately, it'southward well-nigh always impossible to identify the ingredients by reading the characterization (or even the Material Prophylactic Data Sheet), because they're rarely listed. Some brands do list ingredients on their websites or other literature. Be aware that labels can carry misleading claims, such as "maximum UV protection" or "UV stabilized," even though the product doesn't comprise whatever significant UV inhibitors. That's why the spar varnishes that I trust the well-nigh are specifically designed for and tested over time in the almost farthermost conditions. These premium spar varnishes are also formulated to level well (reducing brush marks) and to permit ample working time. Finding such spar varnishes usually requires shopping at a marine supply store or in the ad pagesor websites of boating magazines.
Applying spar varnish
five. Use stain, starting at the lesser, including the bottom border. Work up i side and adjacent edge, across the meridian and downwardly the other side and edge. Then move to the other side and repeat the process.
I'll showtime by preparing this new entry door for finishing past wetting information technology to eliminate subconscious marks ( Photo 1 ), sanding it to remove unsightly factory sanding marks ( Photo 2 )and continuing information technology, so both sides and all the edges tin be finished at the aforementioned time ( Photos 3 and 4 ).
6. Marine spar varnish developed and tested for use on boats provides the best looking, longest lasting clear exterior finish. Yous'll pay a premium price to buy it, but it'south worth every penny.
Next, I'll apply a dark brown oil-based pigmented stain ( Photograph 5 and Sources). Pigmented stain adds more than color—the pigments provide some UV protection for the forest every bit well.
7. Load the brush with varnish and dab off any excess on a clean lint-free fabric to help avoid drips and runs. I adopt a two″ brush with natural china beard.
When the stain is thoroughly dry, I'll apply 3 coats of Epifanes clear high gloss varnish—my favorite premium marine spar varnish ( Photo vi ). To give the door a hand-rubbed advent, I'll switch to Epifanes wood stop matte for the final coat.
8. Brush the panels first, working from the lesser of the door to the peak. This door has simply one panel, at the bottom. Starting time by dabbing finish into the corners and brushing the field that surrounds the raised panel. Then brush the raised console.
This finish—five layers all told—will provide many years of protection before requiring maintenance.
nine. Move on to the rail. Again, showtime at the bottom of the door (including the lesser edge) and work to the top (including the top edge). Brush the varnish a couple inches across the joints with the stiles.
I'll use a 2″ natural bristle varnish brush and small round sash brushes to apply the varnish (run across Sources, below).
10. Castor the stiles and edges from bottom to top. Be careful not to brush onto the rails; terminate at the joint lines. Bank check for drips and then move to the other side of the door and repeat the brushing process.
The 2″ castor will do the bulk of the surface ( Photos 7–x ); the sash brushes provide amend control on the moldings around the raised panels ( Photograph 11 ).
11. A circular sash brush closely follows the molding'south shapes and makes it easier to neatly seal the drinking glass to the forest, equally recommended by door manufacturers.
They're also the all-time tools for removing drips ( Photograph 12 ). Avoid multiple cleanings by submerging the brushes' beard in pigment thinner betwixt coats.
12. Bank check for drips using a light held at a low angle and remove them past stippling with a small, dry out sash brush. Nigh drips result from varnish scraping off the castor on moldings or raised panels, or from puddling in console corners.
SOURCES
Epifanes Articulate Varnish
Epifanes Woodfinish Matte
General Finishes Antique Walnut Gel Stain
2″ Natural Badger-Style China Bristle Brush
Escoda Olive Shape Bristle Circular #2 Sash Brush
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48" Bar Clamp
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1/8" Roundover Fleck
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Source: https://www.popularwoodworking.com/finishing/finish-an-exterior-door/
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