What Spray Paint Works Best for Different Surfaces? A Practical Guide to Using Montana Colors

The question we hear almost daily

Someone gets in touch with us and asks;

“I’ve got this — will MTN 94 work on it?”

Sometimes it’s a bike frame. Sometimes outdoor furniture, wooden, plastic or even fabric. Sometimes a plastic bumper, a concrete planter, or a timber sign that’s been baking in the Auckland sun for years.

Spray paint isn’t one-size-fits-all. Most failures aren’t caused by the paint itself — they come down to using the wrong system or skipping proper surface preparation. Get that part right, and even a simple project can look professional and last. Get it wrong, and it chips, peels, or fades way sooner than it should.

This guide breaks down what spray paint works best for different surfaces using original Montana Colors products available in NZ — helping you get it right the first time.

Spray paint for timber (wood)

Timber is everywhere in NZ — outdoor furniture, ply signs, exterior and interior panels.

For most wood projects, MTN 94 is the go to colour coat because it’s:

• Low pressure (easier control)
• Smooth, matte finish
• Excellent coverage without flooding the surface

But raw timber is thirsty. It soaks up paint unevenly, which can leave patchy colour and wasted paint.

Best approach:

1. Lightly sand the surface to remove fibres, dirt, and old coatings and clean.
2. Use an appropriate primer like the MTN PRO Matt White Base Primer for porous surfaces or an acrylic undercoat.
3. Apply MTN 94 colour in light, even coats. Preferably 2-3 light coats rather than one thick layer.

Primer isn’t optional outdoors. It stabilises the surface, improves adhesion, and helps resist moisture movement — a big deal in humid or coastal NZ areas.

If the timber is treated, oily, or previously coated, surface prep becomes even more important.

Spray paint for metal

Metal projects range from decorative pieces to bikes, boats, automotive parts, and steal fabrication.

Metal itself isn’t the problem — corrosion is. Rust will keep spreading under paint if it isn’t dealt with properly.

For most metal applications:

• MTN 94 works well for most surfaces including decorative pieces and indoor items
• MTN Hardcore, with its glossy finish and higher pressured output, may be preferred when faster coverage is required.
• But the real key is preparation:
• Remove rust and loose paint with a wire brush
• Clean off oils or contaminants using a wax & grease remover
• Employ a suitable metal primer, such as the MTN PRO Etch Primer, or if the surface requires additional sanding prep, the MTN PRO Epoxy Primer would be the more appropriate choice.

Without primer, paint can chip easily because smooth metal offers very little mechanical grip.

Coastal environments add another layer of difficulty. Salt air accelerates corrosion dramatically, so priming and sealing with a varnish like the MTN PRO Clear Coat or MTN PRO 2K Varnish become even more important for longevity.

Spray paint for plastic

Plastic is one of the trickiest surfaces because many plastics are designed to repel things — including paint.

Automotive trims, bike fairings, helmets, model projects, wheelie bins and storage units all fall into this category.

Colour coats like MTN 94, Hardcore or the Water Based ranges can work on plastic, but durability depends heavily on using the correct primer like the MTN PRO Plastic Primer first. Without it, paint may scratch off with minimal effort. 

Light sanding (where appropriate) helps create a key for the primer. Always test on an inconspicuous area first, as some plastics react differently to solvents.

For outdoor plastic items, UV exposure can also degrade both the plastic and the paint over time. To help mitigate this use either the MTN PRO Clear Coat or MTN PRO 2K Varnish.

Hint: Although not UV-resistant, the MTN PRO Plastic Primer, with its clear finish, can also be used as a clear coat.

Spray paint for concrete and brick

Concrete, masonry, and brick are porous and uneven. They absorb paint differently from smooth surfaces, which can lead to dull or patchy finishes if applied directly.

Common projects include:

• Precast concrete
• Garden walls
• Brick & cinder block walls
• Sculptural pieces
• Indoor concrete décor

The process usually involves:

1. Thorough cleaning (remove dust, moss, efflorescence)
2. Allowing the surface to fully dry
3. Using a suitable primer for porous substrates like either the MTN PRO Matt White Base Primer, MTN PRO Universal Primer or an acrylic undercoat.
4. Then applying colour, either MTN 94, Hardcore, Mega or Water Based in multiple light passes
5. For added UV protection we recommend the use of the MTN Mural Water Based Protective Varnish

Humidity trapped in masonry can cause blistering or poor adhesion, so timing matters — especially after rain.

Spray paint for glass

Glass is smooth and non-porous, which makes adhesion difficult.

Standard spray paint can work for decorative indoor items like jars or vases, but durability outdoors is limited unless a proper system is used.

Preparation is critical:

• Remove all grease and fingerprints
• Avoid touching the surface after cleaning
• Use a suitable primer designed to promote adhesion like the MTN PRO Universal Primer
• Then applying colour in multiple light passes
• For added durability and UV resistance we recommend the use of either the MTN PRO Clear Coat or MTN PRO 2K Varnish.

Even then, painted glass is more decorative than heavy-duty. If the item will be handled frequently, expect wear over time.

Spray paint for fabric

Fabric behaves quite differently compared to hard surfaces when it comes to spray paint. It can be done, but the results aren’t necessarily the same as wood or metal.

Common projects include clothing, canvas, shoes, upholstery accents, furniture, car seats and textile-based art. The key thing to understand is that standard spray paint doesn’t absorb into fabric — it sits on top of the fibres.

That means durability and flexibility are the main challenges.

For most fabric applications:

• MTN Water Based spray paint is the best option from the Montana range
• It has lower solvent content, better flexibility, and is less likely to leave the fabric feeling stiff compared to solvent-based paints like MTN 94 or Hardcore
• There’s also a more purpose-built option:
• MTN PRO Vinyl and Fabric Spray Paint — specifically designed for flexible surfaces like vinyl, leather, and some fabrics
• It offers better adhesion and flexibility than standard spray paints
• The colour range is more limited (Black, White, Charcoal Grey, Grey, and Brown), but it’s a strong option where durability matters more than colour choice

Best approach:

• Make sure the fabric is clean and completely dry
• Stretch or lay the fabric flat to avoid creasing
• Apply very light coats, allowing each layer to build gradually rather than saturating the material
• Avoid heavy application — too much paint will cause stiffness and potential cracking when the fabric moves

Unlike timber or metal, primer isn’t typically used on fabric, but control in application becomes even more important.

It’s also worth noting:

• Painted fabric will lose some softness — this is unavoidable
• High wear items (like clothing) generally hold up well, though some minor wear may occur over time with repeated washing.
• For decorative or light-use items (canvas art, display pieces), results can be excellent

If flexibility and long-term wear are critical, using a purpose-built product like the MTN PRO Vinyl and Fabric Paint range will give better results. But for creative, one-off projects, MTN Water Based spray paints are still a solid option when applied carefully.

Tip: Always test on an offcut or inconspicuous area first — fabric types can react very differently depending on weave, absorbency, and fibre composition.

Choosing the right Montana Colors range for the job

Different MTN paints behave differently, even before primers are involved.

 

Surface compatibility still depends on prep and priming, not just the colour coat.

Practical application advice (that actually affects results)

Surface prep is the real secret

Paint sticks best to surfaces that are:

• Clean, free of grease and wax
• Dry
• Stable
• Slightly keyed (not glossy)

Skipping prep is the number one cause of peeling.

Use thin coats and allow flash-off

Heavy coats trap solvents and slow curing.

A better approach:

• Apply a light tack coat first
• Build colour gradually
• Allow 15-30 minutes flash-off between coats. Recoat within 2 hours.
• Varnish with MTN PRO Clear Coat 30min after the last colour coat or with in 2 hours of last colour coat. Otherwise wait between 6-7 days for paint to fully cure before applying varnish.

Drying times vary widely depending on temperature, humidity, and surface type.
Refer to the official Montana Colours technical data sheet for precise times. If you are uncertain, wait up to seven days for the product to fully cure before applying the next product over top.

Outdoor painting in NZ conditions

Local climate plays a huge role:

• Humidity slows drying
• Wind causes overspray and uneven application
• UV exposure fades pigments over time
• Salt air accelerates deterioration on metal

Calm, dry conditions produce the best results.

Common mistakes we observe

One of the biggest mistakes is assuming “spray paint is spray paint.” People often use the same can on timber, plastic, and metal without changing prep or primer. The paint may look fine initially but fail months later.

Another common issue is painting damp surfaces — especially timber or masonry that still holds moisture. The finish may dry on top while remaining compromised underneath.

We also see projects where the colour coat is blamed for poor durability when the real problem was skipping primer on a difficult surface like plastic or bare metal.

Wrap up: matching the paint system to the surface

Spray painting success isn’t about finding a “magic can.” It’s about using the right combination of:

• Proper surface preparation
• Suitable primer
• Appropriate Montana Colors range
• Sensible application technique

If you match the system to the material, you’ll get results that look better and last longer — whether you’re painting art panels, furniture, automotive parts, outdoor art or garden features.

Montana Colors spray paint and primers are available in NZ from AllCity — official Montana Colors stockist.

When in doubt, refer to the official Montana Colors technical data sheet for confirmation or give us a shout at support@allcity.co.nz