If you ask any professional at Clear View Painting what the secret to a 15-year paint job Exterior House Painting is, we won’t say it’s the expensive paint. It’s the prep.
In fact, a professional exterior paint job is typically 80% preparation and only 20% actual painting.
Many homeowners are tempted to rush straight to the fun part, seeing the new color go on. But we have been hired countless times to fix homes where the previous painter skipped the hard work, resulting in peeling after 18 months, wood rot trapped under new latex, and thousands of dollars wasted.
Whether you are a DIYer wanting to tackle your home’s exterior or you just want to know what you should be paying a professional for, this is your definitive, step-by-step guide to prepping your house the right way.
The Professional’s Prep Toolkit
Before you climb a ladder, ensure you have the right gear. Trying to prep without these will double your work time.
- Safety: Sturdy extension ladder (with stabilizers), respirator mask (crucial for sanding), eye protection.
- Cleaning: Pressure washer (careful with the PSI!), stiff-bristle scrub brushes, TSP (Tri-Sodium Phosphate) or eco-friendly substitute.
- Scraping/Sanding: Carbide scrapers (stay sharper longer than steel), 5-in-1 tool, orbital sander, 60-100 grit sandpaper.
- Repair: High-quality exterior wood filler or two-part epoxy (for serious repairs), paintable siliconized acrylic caulk, caulk gun.
- Protection: Canvas drop cloths (plastic can kill your grass if left too long in the sun), painter’s tape, masking paper.
Step 1: Inspection and Site Protection
Before you touch the house, you must protect what’s around it. Paint prep is messy, old paint chips, dust, and cleaning chemicals will fly everywhere.
- Landscaping: Cover bushes, flower beds, and grass with breathable canvas drop cloths. Do not use plastic sheeting on plants in direct sun; it acts like a greenhouse and can cook your landscaping in hours.
- Fixtures: Remove house numbers, mailboxes, and exterior light fixtures. Don’t try to paint around them, it never looks good or professional.
- AC Units: Tightly cover your outdoor air conditioning unit with plastic to keep sanding dust out of the coils.
Pro Question: Can I prep in stages? Yes. In fact, we recommend it. Don’t try to wash, scrape, and sand the whole house in one weekend. Work one side of the house at a time if you are working solo.
Step 2: The Deep Clean
Paint will not stick to dirt, chalky residue, mildew, or cobwebs. Every square inch must be cleaned.
Most pros use a pressure washer, but beware: you can easily gouge wood siding or force water deep behind weatherboarding if you use too much pressure.
- The Solution: Use a cleaning solution (like a diluted bleach mix or specialized house wash) to kill mildew spores.
- The Technique: Wash from the bottom up to prevent streaking, then rinse from the top down.
- Drying Time: This is critical. You MUST let the wood dry completely before moving on. In average humidity, wait at least 2 to 3 full days of dry weather after washing.
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Step 3: Scraping Loose Paint
This is the most labor-intensive step. If paint is flaking, peeling, or blistering, it must come off. You don’t need to remove all the old paint, just the paint that has failed. Use a carbide scraper and pull with the grain of the wood. You must scrape until you reach a solid edge that cannot be lifted with a fingernail.
CRITICAL WARNING: Lead Paint If your home was built before 1978, it likely contains lead paint. Scraping or sanding lead paint creates toxic dust that can severely harm children and adults. If you suspect lead, you must use EPA RRP (Renovation, Repair, and Painting) safe practices or hire a certified professional.
Step 4: Sanding and “Feathering”
Once the loose paint is scraped off, you’re left with a harsh ridge between the old paint and the bare wood. If you paint over this now, your house will look like a topographic map. You must sand these edges to “feather” them, thus creating a smooth transition between bare wood and old paint. Use 60 to 80-grit sandpaper for this rough work.
Step 5: Repairs (Rot and Damage)
Now that the house is clean and bare, you’ll see the true extent of any damage. You must decide what can be patched and what must be replaced.
Pro Guide: Repair vs. Replace
| Damage Type | Severity | Recommended Action | Product |
|---|---|---|---|
| Nail Holes | Small | Fill | Standard exterior wood putty |
| Small Cracks | Hairline | Caulk | Siliconized Acrylic Caulk |
| Surface Rot | Shallow (< 1/4 inch deep) | Dig out soft wood, treat with hardener, then fill. | Two-part wood epoxy |
| Deep Rot | Soft wood extends deep into the board | REPLACE. Do not try to fill deep structural rot. | New lumber/siding |
| Rusted Nail Heads | Bleeding through paint | Sand to bare metal, spot prime immediately. | Rust-inhibitive metal primer |
Step 6: The Forgotten Wash (Dust Removal)
Most homeowners skip this, and it ruins their hard work. After endless scraping and sanding, your house is now covered in a fine layer of dust. Paint hates dust. Use a leaf blower, dry rags, or a very light rinse with a garden hose to remove this sanding dust before the caulk or primer.
Step 7: Caulking and Sealing
Water is the enemy of your home. Caulk is your primary defense, sealing gaps where water could enter behind your siding.
Where to Caulk: Vertical joints where two different materials meet (e.g., wood siding meeting a brick chimney, or window trim meeting siding).
Where NOT to Caulk (Crucial!): Do not caulk the horizontal laps of clapboard siding, and never caulk “weep holes” at the bottom of windows or brick. Your house needs these vents to breathe and let trapped moisture escape.
Step 8: Masking Windows and Doors
Professional painters don’t rely just on a steady hand; they rely on excellent masking.
- Use high-quality painter’s tape (blue or green) for glass and trim you aren’t painting.
- Use masking film or paper to cover entire windows. It’s faster to cover the whole window now than to scrape paint specks off the glass later.
Step 9: The Foundation (Priming)
Do you always need to prime? If you have bare wood, repairs, or chalky old paint, the answer is a hard YES. Paint is for color and UV protection; Primer is for adhesion and sealing.
Pro Guide: Selecting the Right Primer
| Surface Condition | Primer Goal | Recommended Primer Type |
|---|---|---|
| Bare Wood (New or sanded) | Seal wood grain and ensure topcoat bonds. | High-quality Oil-based or advanced Latex exterior primer. |
| Stained/Bleeding Knots | Stop tannins from bleeding through the finish paint. | Oil-based or Shellac-based spot primer. |
| Sound, Previously Painted Surfaces | General adhesion for the new coat. | Usually not needed if the old paint is sound, unless drastically changing color. |
| Masonry/Stucco/Brick | Bind chalky surfaces and resist high pH. | Specialized masonry primer (often acrylic latex). |
Step 10: The “White Glove” Inspection
Before you open your first can of finish paint, do one final walk-around.
- Is every masked area tight?
- Has the primer dried completely according to the manufacturer’s instructions?
- Are there any missed nail pops or cracks you overlooked?
Only when you can answer “yes” to everything is your house actually ready for paint.
Final Thoughts
Exhausted just reading this? We don’t blame you. Proper exterior prep is physically demanding, technically tricky, and requires expensive tools to do safely. If you want the 15-year results without the 80 hours of labor, Clear View Painting is ready to help. We don’t skip steps, and we treat your home like our own.
FAQ About 10 steps to prep your house exterior for painting
How long does it take to prep a house?
For an average 2,000 sq ft home in moderate condition, proper prep can take a DIY team of two people 40 to 80 hours. It is grueling work.
What if it rains after I’ve prepped but before I paint?
Don’t panic. If you have already primed, the wood is protected for a short time. You will just need to let it dry completely and do a light clean to remove any dirt splashed up by the rain before you start painting.
Can I just use “Paint and Primer in One”?
For exterior repaints on sound surfaces, sometimes yes. But for bare wood, repairs, or drastic color changes, “Paint and Primer in One” is rarely as effective as a dedicated primer followed by premium paint.