Outdoor wood finishing disasters top the list of cries for help I get from homeowners across ‘s because successful exterior wood finishing isn’t as simple as you’d think it should be. New wood is always bright, fresh and clean looking, and most homeowners want to keep it that way. Wood that has been pre-treated, and then painted or even stained with semi-transparent stain gives the optimum cost-effectiveness in terms of outdoor survival of wood. Though frustrating at the time, this trouble led me to discover a process that yields the richest looking outdoor wood finish I’ve ever seen. The natural and cedar colours do have pigment, but not enough to create streaking. After about three months of one of the wettest Oklahoma summers ever, several of the finishes have failed to one degree or another while others show no noticeable weathering. We put 3 coats on and love the matte finish and ability to touch up when needed and not clear out the house.
I found that tung oil is the absolute best product available for the inner bore of these instruments of keep moisture from soaking into the wood and causing possible splitting issues. A: I’ve never heard of anyone being so sensitive that they’d react to wood siding on a house that’s made of wood framed walls and roof, but there are options for eliminating the use of wood siding.
They also help protect the wood from sunlight damage to varying degrees depending on their content of organic UV absorbers or inorganic pigments. Given that most wood coatings are rarely expected to last longer than two years in the marine environment—particularly in super-sunny locales—it’s no surprise that we’ve seen more significant changes in the coatings in the last six months than we had in previous checkups.
And, as one poster pointed out, the sun doesn’t have to destroy the finish to upend things. Cedar and redwood have water-soluble tannins in their heartwood that, when moist, will leach out and bleed” through the topcoats, leaving dark, ugly stains. It is possible, but not necessarily a good idea, to wax a completely sheltered exterior door or some architectural millwork. Please note that all Wood Industry subscribers will receive our very popular monthly e-letter. If you strip the finish off this gate I would highly recommend treating it with a borate solution before finishing again. Sealing the wood properly also helps prevent moisture from being driven through the siding by solar radiation.
The reality is that, like much in life, wood protection is all about compromise and balancing your needs with your wants. We’ve rated the test products every six months and reported on the coatings’ durability in the May 2009 (six-month checkup), December 2009 (12 months), and January 2011 (18 months) issues. The thinner coating of these products tends to hide the wood grain but allows the wood texture to show through, particularly on rough-sawn siding (see Figure 1-39). I think exterior millwork is all they do. Yes, I know that they all offer an exterior cladding as an option.
Using Linseed Oil to seal the wood before coating provided some benefit in preventing water damage, even when the coating film had small areas of failure. Transparent, non-flexible, film-forming finishes such as lacquer, shellac, urethane, and varnish are not recommended for exterior use on cedar. As water escapes from the wood fibers, the wood will shrink – this is what causes end- and surface-checking, twisting, cupping, and crooking. Oil finishes don’t provide a protective film that sits on top of the wood like varnish does.
Hemp Shield Wood Finish and Deck Sealer will keep your outdoor wood looking new and natural as long as possible. If your deck is made of CCA lumber and its finish is flaking, we suggest calling a pro equipped to safely remove the old finish, dust, and debris. If applied correctly, a high-quality tinted finish can keep redwood or cedar siding looking close to new for three to five years. Laquer is a quick drying finish that is most typical on commercial furniture and cabinets today.
A protective clear finish that offers long-lasting protection for interior or exterior wood that is exposed to sunlight, water and temperature changes. However, please note that clear products intended for interior use only are not appropriate for exterior use, as they will quickly fail in sunlight. As far as flexibility, it holds up on car bumpers, so surely it will be flexible enough for wood. The end result depends on the surface being dry and free from all dust, dirt, wax, grease or oil before the finishing product is applied. The UV abuse had obviously taken its toll, sucking the life out of most of the coatings, particularly the clear finishes.
Consider sanding raw wood to 120 grit if you are using a film-forming product (not oil or oil finish), like varnish, stain, or paint. Exterior marine varnishes generally need to be sanded and recoated every 24-36 months or more often in full-sun applications. Automotive clear coats may have the durability for outdoor furniture but I wonder how flexible these coatings are. Ideally you shouldn’t finish a basement without getting to know if for at least a couple of years to prove it’s dry. Either way when finishing do an extra coat on your end grain for whatever method. I did it because I didn’t realize the outdoor oil would want to soak into the wood.
Pigmented varnishes fare better because the pigment blocks the effect of UV radiation on the binder material, and are maintained more like paint finishes. The finish on my cedar table (under cover) still looks like an indoor furniture grade finish despite heavy use for 7 years. Our photo of a wood clapboard house in upstate New York (left) shows the very uneven color changes from natural weathering. If you’re not happy with barnboard-grey siding, a film-forming finish is your best choice.
They state that a varnish like glazing of extractives, resins, and sap will develop on the surface of the wood during the planing process interfering with the adhesion of the coating. Although all made of the same material, the finish that makes sense in one situation can sometimes be a disaster on another. If a clear finish is required and the timber has been previously treated with a penetrating stain, the surface will have to be sanded back to remove the unwanted colour.
Cabot Gold is available in four different stain colours and can be used on both cedar and pine. These finishes, while they have come a long way since their introduction, are not quite ready for primetime if you ask me. While the clean up on these finishes is incredibly easy (wash and go) they do not provide the beauty and long lasting protection that oil-based finishes do. Use CAB acrylic lacquer as a crystal-clear alternative to water-based finishes for a non-yellowing film. I once planed all the cedar I used on a deck and then finished the whole thing with spar varnish. Staining and finishing can also be accomplished in one easy step with Stain Varnishes.
Made with PolyWhey, our unique formulation derived from recycled and renewable whey — a byproduct of cheesemaking — delivers a durable, safe finish that has established the highest performance and environmental standards. It gives you extremely high durability for all your exterior furniture, at the same time, providing a rich finish. When Paul Powichroski, Marine Superintendent at the USS Constellation Museum, began working to restore the 156 year-old ship’s interior, he turned to the premium wood finish trusted by wood craftsmen for nearly a century.