Messmer's UV+ Oxford Brown 5G: High-Solids Penetrating Oil Stain

Messmer’s UV+ Oxford Brown is a one-coat penetrating oil-based deck stain available in multiple VOC formulations (550 g/L standard, 250 g/L, and 100 g/L) for regional compliance. The high-solids formula combines trans-oxide pigments for UV protection with fungicides for mildew resistance, penetrating deep into wood pores without forming a surface film.

Skip it if you’re expecting film-forming protection like traditional deck coatings — this product won’t peel because it doesn’t create a surface layer. Worth it for contractors who need predictable coverage: 100-150 sq ft per gallon on rough wood, 150-250 on smooth surfaces, totaling 500-1,250 sq ft per 5-gallon pail.

Coverage Rates and Application Efficiency

Professional contractors praise the deep penetration that prevents peeling and flaking — a common failure point with film-forming stains. The coverage numbers break down cleanly for bid calculations:

Surface Type	Coverage per Gallon	Coverage per 5-Gallon Pail
Rough Wood	100-150 sq ft	500-750 sq ft
Smooth Wood	150-250 sq ft	750-1,250 sq ft

Apply with brush, roller, or airless sprayer — a 3/8” nap roller or airless sprayer with .011” to .013” tip delivers optimal results. The critical mistake contractors make: over-saturating the wood. Any excess material sitting on the surface must be wiped off within 48 hours to prevent tackiness.

Surface temperature matters more than air temperature: keep it between 40°F and 90°F, though the manufacturer recommends 50°F+ for best penetration and cure. Plan for 24-48 hours before rain or foot traffic, with full cure depending on humidity and temperature.

VOC Compliance and Regional Flexibility

Montana contractors working across state lines appreciate the three VOC options:

• 550 g/L standard formulation
• 250 g/L for OTC (Ozone Transport Commission) states
• 100 g/L for CARB/SCAQMD compliance

Cleanup requires mineral spirits, lacquer thinner, or MEK — no water-based cleanup here. The 104°F flash point means proper ventilation and spark-free environments during application.

Wood Type Compatibility and Preparation

The formula works across domestic softwoods: Cedar, Redwood, Pine, and Fir — the standard materials in Montana construction. Pressure-treated compatibility extends to CCA, ACQ, and copper-azole lumber, but new treated wood needs 6-8 weeks of weathering before application.

Wood prep determines success: surfaces must be clean and dry, using Messmer’s Wood Cleaner and Wood Brightener on gray or weathered wood. Moisture content below 12% is non-negotiable — wet wood won’t absorb the stain properly.

For previously stained surfaces, UV Plus works best over bare wood or existing UV Plus applications. Film-forming stains must be stripped first.

Performance Reality

The high solids content (approximately 35-40%) fills wood pores for water repellency while trans-oxide pigments handle UV protection. Oxford Brown delivers what contractors want: a rich, natural look that holds up in sun-exposed areas.

Amazon and retailer data show a 4.2 out of 5 star average, with mixed professional feedback. The negatives: slower drying in high humidity and potential tackiness from over-application if not wiped within 48 hours.

The warranty reality check: manufacturer liability is limited to product replacement if defective — no specific performance duration guaranteed due to variables in wood type, preparation, and exposure.

Montana Application Notes

The non-film-forming chemistry matters in Montana’s freeze-thaw cycles — no surface film means no peeling from moisture trapped under the coating. The 40°F minimum surface temperature allows spring and fall application windows, though 50°F+ delivers better penetration.

The 24-48 hour dry time before rain requires watching Montana’s changeable weather closely. Plan applications during stable high-pressure systems.

For contractors focused on mildew resistance in Montana’s valley bottoms where morning fog persists, the fungicide package provides active protection.

Frequently Asked Questions

Q: Can I apply UV+ over existing deck stains?

UV Plus works over bare wood or previously applied UV Plus surfaces. Non-compatible film-forming stains must be completely stripped first. Test a small area if unsure about compatibility.

Q: What’s the actual coverage I should expect on a typical Montana deck?

Figure 100-150 sq ft per gallon for rough-sawn cedar or pressure-treated decking, 150-250 for smooth milled boards. First-time applications on weathered wood typically hit the lower end of the range.

Q: How long before I need to recoat?

Messmer’s provides no specific duration guarantee due to exposure variables. Industry experience suggests 2-4 years depending on sun exposure and surface type, with horizontal surfaces needing more frequent maintenance than vertical.

Q: Will it work on my 2-month-old pressure-treated deck?

No — new pressure-treated lumber needs 6-8 weeks of weathering before staining. Test moisture content: it must be below 12% for proper absorption.

Q: Why does the stain feel tacky after application?

Over-application is the culprit. Any excess material remaining on the surface must be wiped off within 48 hours to prevent tackiness. This isn’t a film-forming product — excess won’t dry properly on the surface.