8 February 2026
Before repainting a wall, preparing the surface is a decisive step. Some surfaces require particular attention, especially when they show stains, bleed-through, or uneven porosity.
In these situations, applying a finish coat directly is generally not enough. Without a suitable primer, defects are likely to reappear quickly.
Using an appropriate primer stabilises the surface, blocks stains, and ensures a lasting finish.
Why use a primer?
A primer — also known as a base coat — plays an essential role in the success of any painting project.
It helps to:
block stains
even out absorption
improve paint adhesion
prevent uneven sheen
increase durability
This invisible step often makes all the difference.
Which types of stains need to be sealed?
Certain marks will literally bleed through standard paints if they are not treated correctly.
These include:
nicotine
smoke
water rings
soot
yellowing
old water ingress
insect stains (common on ceilings)
These stains contain substances that migrate through paint.
A sealing primer is therefore essential.
ISO 5: the 2-in-1 solution for quick renovations
When stains are moderate and the job calls for efficiency, a sealing paint that also acts as a finish coat can be an excellent option.
Flügger ISO 5 combines a sealing layer and a matt finish coat, saving time while delivering a uniform result.
It is particularly suited to:
homes yellowed by tobacco
marked ceilings
lightly stained walls
quick renovation projects
An efficient choice when you want to keep the number of steps to a minimum.
ISO 10: for more severe stains
When surfaces are heavily marked, it is preferable to use a more technical sealing primer before applying the finish coat.
Flügger ISO 10 is designed to block stubborn stains and prevent them from reappearing. (Sealing primer and satin finish)
It is recommended for:
heavy nicotine staining
water damage
fireplace soot
heavily soiled surfaces
It is often the preferred solution among professionals for major renovation works.
Stop Primer: for blocking difficult bleed-through
Some surfaces present more complex issues, such as tannin bleed-through or persistent staining.
Flügger Stop Primer acts as a true barrier and effectively prepares the surface before painting.
Ideal for:
stained wood
sensitive surfaces
old repairs
uneven surfaces
A technical primer that ensures a reliable result.
Fix Primer: adhesion above all
Not all problems come from stains. Sometimes, the main challenge is adhesion.
On closed or low-porosity surfaces, a primer that promotes bonding is essential.
Flügger Fix Primer provides:
improved adhesion
more even application
a smoother finish
Perfect for avoiding unpleasant surprises.
Wall Primer: evening out uneven surfaces
New or repaired walls often absorb paint unevenly, which can cause streaks or inconsistencies in appearance.
Flügger Wall Primer regulates surface porosity and creates a uniform base.
It is particularly recommended for:
plasterboard
renders and plaster coats
repaired surfaces
porous walls
An essential product for a professional finish.
How to choose the right primer?
Simply ask yourself this question:
What is the main problem with my surface?
Stains → stain-blocking primer
Porous surface → penetrating primer
Closed surface → adhesion primer
Light renovation → 2-in-1 solution
A proper assessment prevents a great deal of rework.
The professional's reflex
Experienced painters know it:
a successful finish always starts with the right base.
Investing in a primer coat allows you to:
prevent bleed-through
reduce the number of coats
safeguard the job
achieve a lasting result
It is rarely an unnecessary expense — and often a real time-saver.
In summary
When faced with stains or difficult surfaces, choosing the right primer is an essential step in ensuring a flawless result.
As every situation has its own specificities, using the appropriate product remains the best guarantee of a successful job.
If in doubt, seeking advice before you start can often help you avoid mistakes… and having to paint twice.
