Which Zinsser is best for mold?

Author: Hosea Fay  |  Last update: Friday, August 22, 2025

Cover any mould and mildew stains with Zinsser Bulls Eye 1-2-3 which is rich in a biocide that fights against fungal degradation and is designed to withstand moisture.

Which Zinsser primer is best on mold?

A popular choice is Zinsser Mold Killing Primer, which is formulated to prevent mold and mildew growth. This type of primer not only covers stains but also contains fungicides that kill existing mold spores and prevent new ones from growing.

Does Zinsser actually kill mold?

Wrapping Up. Based on these reviews, it seems Zinsser Mold Killing Primer really does kill mold on select surfaces.

What is the difference between Zinsser bin and Zinsser 123?

Zinsser BIN is shellac-based, whereas 123 is water-based. This makes Zinsser Bullseye 123 a lot quicker and easier to apply. It's also better suited for use on bare wood, or to prime plastic and composite before painting. BIN may be harder to apply, but it is by far the better stain block.

What is the best primer to kill mold?

A popular choice is Zinsser Mold Killing Primer, which is formulated to prevent mold and mildew growth. This type of primer not only covers stains but also contains fungicides that kill existing mold spores and prevent new ones from growing.

Got Mold? How to treat Mold with Zinsser Mold Blocking Primer Spray.

Which is better, Kilz or Zinsser?

Original Kilz Primer allowed more seep through when put in two coats to two different walls in the same area, whereas Zinsser provided superior coverage.

What happens if you paint over mold with Kilz?

If the moldy surface is not properly cleaned before priming with KILZ® Mold & Mildew, it will likely continue to grow underneath the paint and eventually come back out through paint that cracks or peels or through the back of the wall or surface, especially if it remains damp or wet.

What is Zinsser Bullseye 123 primer used for?

Zinsser Bulls Eye 1-2-3 is a water-based primer and sealer formulated for use on interior and exterior surfaces. It can be used in multiple applications, firstly it fully blocks stains including graffiti, grease, spots, tar and asphalt.

Is Zinsser 123 mould resistant?

Zinsser Bulls Eye 123 is a fast-drying, all-purpose primer, sealer and stain killer for interior and exterior use. It is low odour with excellent adhesion. Mould and mildew resistant, Zinsser Bulls Eye 123 blocks stains and is rust inhibitive, so it is ideal for new metal.

Can you paint straight over a Zinsser bin?

Yes, The Zinsser BIN Primer can be painted over.

What is the best primer to stop mould?

Zinsser Mold Killing Primer is a water-based EPA registered fungicidal protective coating that can be used to paint over and kill all existing mold, mildew, moss, fungi, odor causing bacteria and any other fungal organisms.

What is the best paint to get rid of mold?

What paint stops mould? No paint will stop mould but there are some trade paints with active ingredients that inhibit and resist mould growth. Zinsser Mould Resistant Paint is perfect for high-humidity areas of the home including kitchens and bathrooms, as is Crown Trade Clean Extreme Mould Inhibiting Scrubbable Matt.

What is the best mold killer for painted walls?

If you're wondering what kills mold on walls, some of the best solutions are white vinegar, hydrogen peroxide, baking soda, bleach, and commercial mold removers. Note that you should only use a bleach solution when dealing with moderate to severe mold damage, and make sure not to combine bleach with other cleansers.

Can you paint over mold with Zinsser?

Yes, The Zinsser Interior Perma White Matt can be used however we would recommend to give the area a good rub down before applying. Yes, If you are using the Zinsser Interior Perma White Matt as a undercoat it will stop the mould coming through.

How many coats of Zinsser mold killing primer?

Customers say the Zinsser Mold Killing Primer is effective in covering and preventing mold, with many noting its ease of application and quick drying time. Users appreciate its low odor and good coverage, often achieving satisfactory results with just one coat.

Which Zinsser primer is best on mould?

Zinsser Cover Stain Primer is a great stain-blocking primer that will cover unsightly mould and mildew stains with ease.

Can I use Zinsser 123 in the bathroom?

Is Zinsser bulls eye 123 good for dark grey walls in bathroom? Yes, Zinsser Bulls Eye 1-2-3 is perfect for bathroom walls and can be used before applying any colour on top.

Do you need to sand before using Zinsser 123?

It adheres to almost all surfaces without prior sanding. Bulls Eye 1-2-3 Plus can be applied on many interior and exterior surfaces, such like walls, ceilings, doors, trims and other paintable surfaces. Seals porous surfaces.

What is the difference between Zinsser Bulls Eye 1-2-3 and bin?

Zinsser BIN is a shellac-based paint, Bullseye 123 is water-based. They're both adhesion primers and stain blocks, but each one is better for different jobs. For example, Zinsser BIN is better for blocking water stains and gripping to varnished wood. Zinsser Bullseye 123 can be used outside and works better on plastic.

How many coats of Zinsser 123 primer should I use?

In most cases only one coat is necessary. Porous surfaces may require two coats to properly seal. Prime entire surface for best results. Thinning– If thinning is necessary add no more than 10 % clean water and stir thoroughly.

Is Zinsser bullseye 123 primer waterproof?

It dries to a smooth, tight, water-resistant film that is perfect for painting iron railings, steel doors, metal panels, duct work, galvanised gutters - any interior or exterior metal surface. Bulls Eye® 1-2-3 is our classic universal interior and exterior, water-based, primer-sealer.

What is the best primer to block mold?

KILZ® MOLD & MILDEW Primer is a water based primer-sealer-stainblocker that is specially designed for residential surfaces in high humidity, moisture and temperature environments such as kitchens, bathrooms, powder rooms and laundry rooms.

How do you treat mold before painting?

Start by washing the surface with a solution of one part liquid bleach and three parts water. Apply the solution and scrub the mildewed area. Allow the solution to remain on the surface for 10 minutes. Rinse thoroughly with water and allow the surface to dry before painting.

How to get rid of mold on walls permanently?

How to Clean Mould on Walls in Three Steps
  1. Mix one part bleach to four parts water.
  2. Wipe and gently scrub the mould until it is gone.
  3. Finish by wiping away the bleach mixture and dry the area well with a soft cloth.

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