When you're starting a painting project, it might be tempting to assume all paint is created equal. But there’s a major distinction between interior and exterior paint — and using the wrong one can lead to cracking, peeling, fading, or even health risks.
In this FAQ blog, we’ll break down the key differences and help you choose the right paint for your project.
1. Ingredients and Formulation
Interior Paint:
Formulated for low- to no-VOC (Volatile Organic Compounds) to reduce indoor fumes
Designed for smooth application, easy cleanup, and minimal odour
Focuses on durability against scuffs and stains
Exterior Paint:
Contains additives to resist UV rays, mildew, rain, snow, and temperature swings
Stronger smell due to higher VOCs (ventilation required)
Formulated for maximum adhesion and flexibility on surfaces like wood, vinyl, or masonry
Bottom line: Interior paint prioritizes safety and indoor durability, while exterior paint is built to withstand nature’s elements.
2. Durability and Resistance
Interior Paint:
Resists marks, cleaning, and indoor wear and tear
Not built to handle intense sun or rain exposure
Exterior Paint:
Formulated to resist fading, chalking, cracking, and mildew
Flexible in extreme hot/cold to prevent flaking or peeling
🚫 Don’t use interior paint outside — it won’t last.
🚫 Don’t use exterior paint indoors — it may contain unsafe additives and strong fumes.
3. Surface Compatibility
Interior Paint:
Ideal for drywall, trim, ceilings, and indoor wood
Available in a wide variety of finishes like matte, eggshell, satin, and gloss
Exterior Paint:
Bonds to wood, brick, stucco, vinyl, concrete, aluminum, and more
Often includes UV-protective pigments to slow fading
4. Finishes and Colour Retention
Interior paint holds colour well indoors and offers a broader selection of designer finishes
Exterior paint is optimized for colour retention outdoors, especially against fading from the sun
For long-lasting results, always use the correct type for your surface and location.
Need Help Choosing the Right Paint?
Whether you're tackling an indoor renovation or freshening up your home's curb appeal, Randall’s has you covered. Browse our paint collections — including trusted brands like Benjamin Moore — or let our experts help you make the right choice.
✅ Quick Links to Help You Get Started:
-
Contact Us for expert advice or colour help
-
Painter Order Form to order supplies easily
-
Our Services including colour consultations and more
-
Explore Paint Collections for interior and exterior options