Solutions
Wood and walls that survive Indian monsoon, sun, and salt.
Validated by
ihd Dresden + ift Rosenheim·sd ≈ 0.01·DIN 53160·Colour class A1
The pain — diagnosed
In Mumbai by August, the new wooden deck has black streaks. By the next March, the lime-plastered facade has peeling sheets. By the third monsoon, the cedar shutters have cracked at every joint. The wood and the wall are sound — the failure is in the layer on top of them.
What the substrate endures
Monsoon
8-12 weeks of horizontal rain at 85%+ humidity. Surface temperature drops; substrate stays warm. Vapour pressure pushes water under any sealed film.
Summer UV
Index 9-11 for four months across most of India. Plastic films chalk, oxidise, and microcrack year after year.
Salt aerosol
Coastal sites collect airborne salt week after week, year-round. Salt is hygroscopic; it draws moisture into every microcrack it finds.
Diurnal cycling
Hill stations swing 35 °C by day to 8 °C at night. The substrate flexes; the film does not flex enough and lets go at the bond line.
Film-forming coatings — acrylic emulsion on walls, polyurethane on wood — seal the substrate from the room side. Vapour rising from below cannot escape upward through the film. It condenses behind the film. The bond fails from the inside. By the time the bubble or the crack appears, the wood or the wall has already absorbed weeks of trapped water.
The cycle
bubble → scrape → repaint → bubble. In the worst monsoon zones, a repaint every season or two.
The mechanism
Mechanism · 01
LEINOS 150, 223, and 236 are linseed-oil-based — they soak into the wood pores and cure inside the wood, not on top of it. The 260 wood varnish stays open-pore and vapour-permeable, so the wood releases moisture instead of trapping it. Either way nothing seals the surface: water vapour can move back out instead of being held behind a sealed film, and the wood underneath stays sound for years.
Mechanism · 02
The LEINOS silicate facade paints — ProfiSol 612 and UniverSil 614 — stay open-pored after curing: vapour- and CO₂-permeable, sd ≈ 0.01 for 612 per TDS. Monsoon vapour passes through the mineral coat instead of being blocked by a sealed film. The bond line never gets wet from behind.
Mechanism · 03
The water-glass binder in ProfiSol 612 and UniverSil 614 silicifies into the mineral substrate — the colour coat and the wall become one mineral layer, with no bond line to fail. 614 even re-mineralises firmly-adhering old synthetic coats. A silicate facade ages by extremely slow, even chalking — a material-typical property of mineral paint — instead of peeling in sheets.
Open-pore impregnation primer with IPBC sapstain barrier — for untreated softwood and absorbent hardwood before LEINOS varnish or glaze topcoats.
View productPenetrating oil-resin finish for exterior wood, designed for terraces, decking, and outdoor timber.
View productPenetrating oil-resin treatment for tropical hardwood furniture and weathered exterior timber — refreshable without sanding.
View productOpen-pore wood stain for timber facades, cladding, windows, and doors — vapour-permeable.
View productAlso in this hub: Mineral Plaster Primer (622) · ProfiSol Facade Paint Fine (612) · UniverSil Facade Paint Fine (614)
Application
For wood: sand to bare timber, brush off dust, allow to reach moisture content of 15% or below (per TDS). For facades: remove loose and flaking coatings; firmly-adhering old synthetic coats can stay — UniverSil 614 is formulated to re-mineralise them. Prime chalking or very absorbent mineral surfaces with 622.
Wood: prime absorbent timber with a generous coat of 150 impregnation primer; after about 20 minutes redistribute any glossy excess so the oil sits in the grain, not on the surface, then dry 16–24 hours. Walls: apply 622 mineral primer with a brush, working into the substrate; recoatable after about 12 hours (per TDS).
Wood: two coats of 223 teak oil or 236 terrace wood oil, recoating after 16–24 hours; the 260 wood varnish takes 2–3 thin coats, with the third recommended on sun-facing elevations. Walls: at least two thin coats of 612 or 614 silicate paint in a cross-pattern, allowing at least 12 hours between coats; protect fresh coats from rain (per TDS).
Wood: inspect after one monsoon; spot-refresh any sun-bleached or salt-exposed zones with a single thin coat over a cleaned surface. Walls: a silicate facade ages by slow, even chalking rather than peeling — rinse off dirt after the monsoon and leave the mineral coat to weather honestly.
Per-product TDS sheets are the authoritative source for coverage, drying intervals, and tool selection. Use these steps as the system-level shape, then download the relevant TDS from each product page.
Lab evidence
Independent labs, named standards, batch-traceable certificates.
Weathering guidelines (260)
Vapour-open silicate (612)
Skin-contact tested (260)
BFS 26 (612/614)
Compare
Conventional path
What fails
Film seals the wall. Monsoon vapour gets trapped behind it. Bond fails inside-out. Bubbling appears within a monsoon season or two. In-film biocide depletes; mould returns.
With LEINOS instead
Why it holds
622 primer + ProfiSol 612 / UniverSil 614 silicate paint — open-pored, silicified into the substrate, colour stability class A1; ages by slow, even chalking instead of peeling.
Conventional path
What fails
UV chalks the film; salt cracks it; water enters cracks; wood greys under an intact-looking film. Refresh requires full sanding back to bare timber.
With LEINOS instead
Why it holds
223 teak oil / 236 terrace oil / 260 open-pore varnish — nothing seals the wood, so there is no sealed film to fail. Refresh is a single thin coat over a cleaned surface, no sanding needed.
Conventional path
What fails
Each repaint adds another sealing film on top of the last. Trapped vapour lifts the whole stack; the thicker the build-up, the bigger the sheets that peel. The wall never gets to dry out.
With LEINOS instead
Why it holds
UniverSil 614 — re-mineralises firmly-adhering old dispersion coats: a vapour-open silicate colour layer replaces the seal-and-repaint cycle, and the wall breathes again.
Specifier questions
Yes — as a maintained system. LEINOS 223 teak oil or 236 terrace wood oil penetrates the timber and protects it through monsoon cycles; plan a maintenance recoat typically every 12–24 months depending on sun and rain exposure (per TDS). Softwoods need refreshing more often than dense hardwoods like teak. The refresh is a single thin coat over a cleaned surface — no sanding, no stripping; on greyed teak, prep with the 940 greying remover first.
No — wood and mineral substrates need different chemistry. Wood takes penetrating linseed oils (223, 236). Facades take the silicate system — 622 mineral primer where absorbency needs evening, then ProfiSol 612 on mineral render or UniverSil 614 over a firmly-adhering old synthetic coat. They share a philosophy (breathable, no sealed film, naturally weathered) but the binder is different.
No — 665 is an interior lime paint (per its TDS). For facades, LEINOS uses silicate chemistry: ProfiSol 612 silicifies into mineral render, and UniverSil 614 re-mineralises walls that already carry a firmly-adhering old synthetic coat. Both stay vapour- and CO₂-permeable, hold colour at the highest stability class A1 (BFS 26), and cure alkaline (pH ≈ 11), which by itself leaves mould and algae little foothold; 614 additionally carries a film-protection preservative, disclosed on its datasheet.
