The question of sealant drying time often appears after application, when a bath, sink, or window joint needs to be used quickly. Skin formation and full curing are not the same thing.
What drying means
A skin forms first, but the material inside is still curing. Load or wet the joint only after the time stated for the specific product.
- skin time does not mean full readiness
- a thick joint cures longer
- cold air and poor ventilation increase waiting time
What affects time
Curing depends on sealant type, layer thickness, temperature, humidity, ventilation, and substrate preparation. Silicone in water-contact areas must not be applied over water or soap residue.
- clean dry degreased junction
- consistent joint geometry
- correct application temperature
Common mistakes
The joint is most often damaged by early water contact, application over old mold, or a layer that is too thick for the available curing time.
- using the shower in the first hours
- new material over old weak silicone
- no time reserve before use
Drying times of LACRYSIL sealants
The figures below come from the product specifications and descriptions and apply to room conditions. Cold, high humidity and thick joints make them longer.
- Sanitary and Universal silicone: full layer formation in 24-48 hours, applied from 0°C to +40°C
- Sanitary acrylic: initial set in 20-30 minutes on absorbent surfaces; full formation in about 2 days, up to 5 days in unfavourable conditions
- Universal acrylic: a 4 mm wide joint fully forms in 2 days on absorbent surfaces and up to 5 days on non-absorbent ones
- Coloured acrylic: initial set in 10-30 minutes, full formation in 24 hours, but keep water off for 48 hours
- Installation joint sealants A and B: 24-48 hours, A up to 6 days in unfavourable conditions; keep water off the finished layer for 72 hours
- 2 in 1 acrylic sealant-adhesive: initial set in 15 minutes, full formation in 2 days, up to 5 days in unfavourable conditions
- MS Polymer Universal sealant-adhesive: 24-48 hours; it cures inward at about 2 mm per day, so a deep joint takes longer
- Fireplaces and stoves silicate sealant: 24-48 hours, up to 5 days in unfavourable conditions
For a bathroom this means: keep a sanitary silicone joint dry for at least a day, preferably 48 hours. An acrylic joint needs longer and should not face direct water jets.
What to view in the catalog
The main reference for this job is Silicone sealant “Sanitary”. Also compare the related materials below.
FAQ
When can silicone sealant contact water?
LACRYSIL sanitary and universal silicones fully form in 24-48 hours. For a normal joint at a bath or sink plan for 48 hours, longer for a thick joint or a cool room.Why is the joint sticky after the top has dried?
A skin may have formed while the inner layer is still curing, or the bead was applied too thickly.
