Title: Painting LP SmartSide Siding: Tips for a Flawless Finish
Painting LP SmartSide siding correctly is essential for achieving a flawless finish that protects your investment and looks beautiful for years. LP SmartSide engineered wood siding remains one of the most popular siding materials in Minnesota, and its excellent paintability is one of its greatest advantages. At Weatherguard Construction, more than two decades of exterior expertise since 2001 include extensive experience painting and repainting LP SmartSide across Stillwater, Woodbury, Minneapolis, the greater Twin Cities, and now the Chicago and Denver metro areas. As a certified LP SmartSide installer, Weatherguard knows exactly how to maximize this product's performance.
Why LP SmartSide Is Great for Painting
LP SmartSide engineered wood siding features a factory-applied primer that provides an excellent base for topcoat application. The treated wood strand substrate accepts paint beautifully, creating strong mechanical and chemical bonds that keep paint firmly adhered through Minnesota, Illinois, and Colorado’s demanding seasons. Unlike vinyl siding, which limits you to factory colors, LP SmartSide can be painted any color — and repainted whenever you want a new look.
The SmartGuard manufacturing process treats the wood strands with zinc borate and wax to resist moisture, fungal decay, and termites. This stable substrate doesn’t expand and contract as dramatically as natural wood, which translates to less paint stress and longer paint life. For homeowners considering deeper hues, modern fade-resistant, heat-reflective acrylic formulas help maintain color and reduce heat buildup on darker shades.
When to Paint LP SmartSide
New Installation
LP SmartSide comes with a factory-applied primer that should be topcoated within 180 days of installation. This factory primer is designed specifically to accept topcoat paint and provides excellent adhesion. Applying your topcoat within this window ensures optimal performance and helps with long-term finish consistency.
Weatherguard Construction coordinates siding installation and painting so the topcoat is applied promptly after installation, and all field-cut edges are properly sealed and finished from the start. If installation occurs late in the season and topcoating must wait, plan on a thorough cleaning and, if needed, repriming areas exposed to weather before painting in spring.
Repainting Existing LP SmartSide
LP SmartSide typically needs repainting every 8–15 years depending on sun exposure, elevation (UV is stronger in Colorado), color choice, and paint quality. Signs that it's time to repaint include noticeable fading, chalking (a powdery residue on the surface), hairline checking in the paint film, or caulk failure at joints. Addressing these signs promptly prevents moisture from reaching the substrate and extends the life of your siding.
Choosing the Right Paint for LP SmartSide
LP Building Solutions recommends 100% acrylic latex exterior paint for LP SmartSide siding. Acrylic latex provides the flexibility, adhesion, and durability needed for Upper Midwest and Front Range temperature swings. Updated top paint recommendations for 2025–2026 include low-temperature and early-rain-resistant options that extend the painting season:
Premium Options (100% acrylic):
- Benjamin Moore Aura Exterior (Color Lock technology; excellent color retention)
- Benjamin Moore Element Guard (moisture-tolerant; low-temp application down to 35°F)
- Sherwin-Williams Emerald Exterior or Emerald Rain Refresh (advanced UV and dirt pickup resistance)
- Sherwin-Williams Latitude (WeatherFlex technology; low-temp cure down to 35°F; early rain resistance)
- Sherwin-Williams Duration Exterior (durable acrylic with excellent hide)
Mid-Range Options:
- Benjamin Moore Regal Select Exterior
- Sherwin-Williams SuperPaint Exterior (current enhanced formula)
Avoid: Oil-based paints, elastomeric coatings, and solid-color stains are not recommended for LP SmartSide as they may not perform properly with the substrate. For very dark colors, choose premium acrylics formulated with fade-resistant pigments and heat-reflective technology.
Surface Preparation for LP SmartSide
New Siding Preparation
Factory-primed LP SmartSide requires minimal preparation for initial painting:
- Clean the surface — Remove construction dust, dirt, and debris with a soft brush or damp cloth.
- Inspect for damage — Check for installation nicks, scratches, or exposed edges that need spot priming.
- Spot prime — Prime any cut edges, scratches, nail heads, or areas where the factory primer has been compromised with a quality exterior acrylic primer.
- Sealants and joints — Caulk vertical joints at corners and around windows/doors with a high-performance, paintable sealant (meeting ASTM C920). Do not caulk horizontal lap joints or butt joints; those should be properly flashed per LP installation instructions.
Repainting Preparation
Existing painted LP SmartSide requires more thorough preparation:
- Low-pressure wash/soft wash — Clean the surface to remove dirt, mildew, and chalking. Keep pressure under 1,200–1,500 PSI, use a 40° tip, and maintain a safe distance to avoid forcing water behind laps. A mild detergent or manufacturer-approved house wash helps lift contaminants; use a mildewcide where biological growth is present.
- Allow complete drying — Let siding dry 24–48 hours (longer in cool/humid weather). The substrate must be dry before priming or painting.
- Scrape and sand — Remove any peeling or flaking paint and feather edges smooth (120–180 grit) to avoid telegraphing.
- Spot prime — Prime any bare substrate with a quality 100% acrylic bonding primer. Use stain-blocking primer only if discoloration or tannin bleed is evident.
- Caulk and repair — Refresh failed caulking with a paintable, permanently flexible sealant. Replace damaged boards and prime any exposed cut edges before painting.
Application Techniques for a Flawless Finish
Brush vs. Spray vs. Roll
Spraying is Weatherguard’s preferred method for LP SmartSide siding. Airless spraying delivers uniform coverage and a smooth finish on the wood-grain texture. Sprayed coats are followed by back-brushing or back-rolling on critical areas to work paint into the texture and achieve proper film build. Typical tip sizes for exterior acrylics are .015–.017; always follow the paint manufacturer’s recommendations and protect nearby surfaces from overspray.
Brushing is ideal for trim, cut-in around windows and doors, and detail work. Quality angled brushes provide precise application where spraying is impractical.
Rolling can be effective for smooth-faced LP SmartSide panels but is generally slower than spraying for large areas. If rolling, use a 3/4" nap roller on textured lap to work paint into grooves.
Number of Coats
LP Building Solutions requires a minimum of one coat of 100% acrylic latex paint over the factory primer for warranty compliance. For best results, Weatherguard Construction applies two full coats to achieve the recommended dry film thickness (DFT), enhance color richness, and improve longevity against UV, moisture, and freeze-thaw cycles. Always apply at the spread rate on the paint’s technical data sheet.
Temperature and Weather Requirements
Follow the paint label for temperature and cure guidance. Many modern 100% acrylics allow application between 35–90°F. Key best practices:
- Ensure both air and substrate temperatures are within the paint’s specified range and remain there for at least 24 hours.
- Keep the surface at least 5°F above the dew point to prevent condensation.
- Avoid painting in direct, intense sun, on hot surfaces, or in high winds.
- Respect early-rain resistance times (some premium paints can handle rain in 1–2 hours).
- In Minnesota and Illinois, prime painting months are typically April–October; in Colorado, plan around strong UV and afternoon storms. Low-temp acrylics can extend the season into early spring and late fall on favorable days.
Maintaining Painted LP SmartSide
Proper maintenance extends the life of your painted LP SmartSide siding:
- Seasonal inspection — Walk around your home each spring and fall, looking for paint damage, caulk failure, or moisture issues.
- Gentle cleaning — Rinse siding annually with a garden hose and soft brush to remove dirt and mildew. Avoid aggressive pressure washing.
- Prompt repairs — Address paint chips, cracks, or caulk failures promptly to prevent moisture infiltration.
- Reduce wear — Keep landscaping trimmed away from siding, adjust sprinklers to avoid wetting walls, maintain gutters/downspouts, and manage snow piles along the foundation.
Contact Weatherguard Construction at (651) 439-4320 or book your free consultation to discuss your LP SmartSide painting project. Weatherguard serves homeowners across Minnesota from the Stillwater headquarters, plus Schaumburg, IL in the Chicago suburbs and Centennial, CO in the Denver metro.
Frequently Asked Questions
Can you change the color of LP SmartSide siding?
Absolutely. LP SmartSide can be repainted any color at any time, giving homeowners complete flexibility to update their home's appearance. For darker colors, choose premium 100% acrylic paints formulated with fade-resistant and heat-reflective pigments for better long-term performance.
How long does paint last on LP SmartSide?
With quality 100% acrylic paint and professional application, paint on LP SmartSide typically lasts 8–15 years. Lighter colors generally last longer than darker colors, and north-facing walls typically outlast south- and west-facing walls due to lower UV exposure. High-elevation UV in Colorado can shorten cycles slightly; premium topcoats help offset this.
Does LP SmartSide need to be primed before painting?
New LP SmartSide comes with a factory-applied primer that serves as the base for your topcoat. Additional full-surface priming is not required unless the factory primer has been weathered beyond the 180-day window or shows degradation. Always spot-prime cut edges, scratches, bare substrate, and any repaired areas before painting.
What sheen should I use on LP SmartSide siding?
Satin or low-lustre is the most popular and recommended sheen for LP SmartSide siding. It provides a subtle glow while offering good moisture resistance and cleanability. Semi-gloss is preferred for trim pieces. Learn more in the paint finishes guide.
