"Natural stone" is not one substrate. Polished granite barely absorbs anything, travertine has open pores, and sandstone can drink several times more preparation than either. Each needs its own sealer, and "which sealer for stone" has no single answer.
The finish counts too: to a sealer, the same granite polished and flamed is two different substrates.
In short
Stone first, then the surface finish.
Polished and flamed granite are two substrates despite the same name.
Absorbency decides the coverage.
Travertine and sandstone take up more than polished granite - you see it in square metres per litre.
Marble is sensitive to acids.
Choose cleaning preparations carefully; an acidic cleaner can dull a polished surface.
A wet look deepens the veining.
On stone with a strong pattern the difference is greater than on concrete paving.
Five substrates and their preparations
| Stone | What sets it apart | Recommended products |
|---|---|---|
| Polished granite | Very low absorbency, smooth surface | SG-1 invisible, SG-2 wet look |
| Flamed granite | Open structure after thermal working | HG-1 invisible, HG-2 wet look |
| Marble | Acid-sensitive, polished surface | SM-1 invisible, SM-2 wet look |
| Travertine | Open pores and cavities | ST-1 invisible, ST-2 wet look |
| Sandstone | High absorbency, soft structure | HP-1 invisible, VP-1 for walls |
Why the finish changes as much as the stone
Polishing closes the pores; flaming opens them. The same block of granite worked two different ways will take a different amount of preparation and spread it differently. Hence SG-1 for polished and HG-1 for flamed - not a marketing variant, a different substrate.
If you are not sure which finish you have, test it with a hand and some water: a polished surface is smooth and a drop sits on it for a while, a flamed one is rough and pulls water in faster. The same test also tells you how much preparation the stone will drink.
Natural stone sealers
Professional sealers for granite, marble, travertine and sandstone - invisible and wet look.
StandardSandstone wall and facade sealer VP-1 CTS Chemistry
45,40 zł
36,18 zł/L
StandardBrick and engineering brick sealer VC-1 CTS Chemistry
42,50 zł
33,90 zł/L
PremiumTravertine sealer, wet look ST-2 CTS Chemistry
121,70 zł
121,70 zł/L≈ 6,09 zł/m²
PremiumTravertine sealer, invisible finish ST-1 CTS Chemistry
61,40 zł
61,40 zł/L≈ 3,07 zł/m²
PremiumMarble sealer, wet look SM-2 CTS Chemistry
121,70 zł
121,70 zł/L≈ 6,09 zł/m²
PremiumMarble sealer, invisible finish SM-1 CTS Chemistry
61,40 zł
61,40 zł/L≈ 3,07 zł/m²
PremiumPolished granite sealer, wet look SG-2 CTS Chemistry
121,70 zł
121,70 zł/L≈ 6,09 zł/m²
PremiumPolished granite sealer, invisible finish SG-1 CTS Chemistry
61,40 zł
61,40 zł/L≈ 3,07 zł/m²
Anti-graffiti and stone facades
A stone facade adds graffiti to the list: spray paint should come off easily. This is where ProtectGuard MG for marble and granite excels, along with its water-based version, ProtectGuard MG Eco, for low-absorbency stone.
Common questions
Will one sealer do for a terrace of mixed stone?
Not always. If the substrates differ in absorbency, the same preparation will behave differently on them - and most likely look different too. On mixed surfaces, do a small test patch on each material.
Will a granite sealer work on marble?
Better not. For marble, reach for SM-1 or SM-2. Use another preparation only if marble is on its list of permitted substrates.
How much will sandstone drink?
More than granite; how much depends on the stone. Sealer coverage is given as a range, and the calculator on the product page turns it into litres once you enter the area and the absorbency.
Does a wet look on stone look the same as on paving?
It is usually more pronounced, because stone has a pattern of its own - veining and colour variation get deeper. On strongly patterned material that is an argument for a test patch, because the effect cannot be undone.
