Choosing the right primer type

[DarkKnight]

Hi all! What’s the difference between a stain-blocking primer and a bonding primer, and in what situations does each one work best? Thank you in advance!

[Downaski]

Hi there!

Stain-blocking primers and bonding primers serve different purposes, and knowing when to use each one can really improve your results.

Stain-blocking primers are meant to seal in and stop stains from showing through the topcoat. They work best on surfaces with water stains, smoke damage, grease, crayon marks, or tannin bleed from certain woods like cedar or redwood. These primers are a must if you're painting over areas with visible discoloration or anything that might bleed through the paint.

Bonding primers are used to help paint stick to hard-to-paint surfaces. These include glossy finishes, tile, vinyl, laminate, or metal. They create a surface that allows paint to adhere properly, which reduces the chances of peeling later on.

So, in short:

• Stain-blocking primer is for covering up stains and preventing them from coming through.
• Bonding primer is for making sure the paint sticks to smooth or slick surfaces.

Sometimes you might need both, depending on the situation.

Hope this helps!

[DarkKnight]

Thank you! Also, do primers help paint last longer or are they mainly for adhesion and covering stains?

[Downaski]

Primers definitely do more than just help with adhesion or covering up stains. A good primer can actually make the paint job last longer as well. It creates a solid base for the paint to grip onto, which helps prevent peeling, chipping, or early wear and tear, especially on tricky surfaces or in high-traffic areas.

Think of it like this: primer helps the paint stick better, evens out the surface, and seals things in so the topcoat has a smoother and stronger foundation. This makes the finish look better and hold up over time.

So while adhesion and stain-blocking are the main jobs of a primer, it also plays a big part in how durable your paint job will be. Skipping primer can sometimes lead to problems showing up sooner than you would like.

Hope this makes sense!

[DarkKnight]

Thanks! For surfaces that have both stains and are glossy, would it be better to use a separate stain-blocking primer and bonding primer, or are there products that can handle both jobs at once?

[Downaski]

For surfaces that are both stained and glossy, there are primers designed to handle both jobs in one product. These are often labeled as stain-blocking bonding primers or multi-purpose primers. They are made to seal in stains and also create a surface that paint can stick to, even on slick or shiny finishes.

Using an all-in-one primer like this can save time and effort because it takes care of both problems at once. But if the stains are very heavy or stubborn, sometimes it’s better to use a dedicated stain-blocking primer first, and then apply a bonding primer over it for extra grip.

For most everyday situations, a good quality multi-purpose primer should be enough.