Primary recommendation
MR350 Sanitary Silicone
Primary choice for humid indoor joints around showers, tubs, basins, sinks, tile and glass where a mold-resistant sanitary seal is needed.
Sealant Application Guide
Silicone Sealant and Caulk for Kitchen and Bathroom Applications
Kitchen and bathroom joints need a silicone sealant or caulk selected for water splash, cleaning products, humidity and changing surface temperatures. MR350 is the primary Vesta recommendation for sanitary wet-area joints, while EX230 can suit compatible glass, glazed tile and general-purpose non-porous details where sanitary mold resistance is not the main requirement.
Recommended Vesta products
Start with the product matched to the joint exposure, then confirm substrate compatibility and project requirements.
Alternative for specific conditions
EX230 Acetoxy Silicone
General-purpose option for compatible glass, ceramic tile and glazed non-porous details where fast cure matters and sanitary mold resistance is not the selection driver.
Where this application fits
Use the scene first to identify the joint, then check the substrate, exposure and movement below.
Shower, tub and tile joints
Wet-area perimeters and tile transitions exposed to humidity and routine splash.
Kitchen sinks and countertops
Visible perimeter joints around sinks, worktops and compatible fixtures.
Glass and glazed surfaces
Glass partitions, shower screens and compatible glass-to-tile details.
- Shower screens and tub perimeters
- Tile corners and glass-to-tile joints
- Bathroom basins, vanities and splash zones
- Kitchen sink and countertop perimeters
- Compatible glazed-surface repair details
Common substrates
- Ceramic tile and porcelain
- Glass and glazed surfaces
- Compatible metal fixtures
- Basins, tubs and countertops
- Other non-porous substrates after compatibility review
Key performance requirements
- Resistance to humidity and routine water splash
- Clean tooling around visible fixtures
- Adhesion to tile, glass and compatible fittings
- Color and appearance stability
- A product matched to cleaning and service conditions
Product selection guidance
Choose by service condition
Choose MR350 for wet-room and sanitary perimeters. Consider EX230 only after confirming that acetoxy cure is compatible with the substrate; it is not the default for sensitive metals, mirrors, natural stone, concrete or alkaline surfaces.
Before Application
Application considerations
- Remove soap residue, oil, dust and loose material before application.
- Confirm joint depth, movement and whether a backing material is required.
- Test adhesion and appearance on unfamiliar or coated substrates.
- Allow the bead to cure under the conditions stated in the current technical data.
Common Questions
Frequently asked questions
Which Vesta sealant is the first choice for showers and tubs?
MR350 Sanitary Silicone is the primary recommendation for humid indoor joints around showers, tubs, tile, basins and glass. Final selection still depends on the substrate, joint design and service conditions.
Can EX230 be used on every bathroom surface?
No. EX230 is an acetoxy silicone intended for compatible glass, tile and glazed non-porous surfaces. Sensitive metals, mirrors, natural stone, concrete and alkaline substrates require a compatibility check or a different product.
Are these products suitable for permanent water immersion?
Permanent immersion is not a standard published use for these products. Send the substrate, exposure and project requirements to Vesta for written compatibility guidance.
Continue Exploring
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Technical Knowledge
Related insights
Neutral or Acetoxy Silicone? A Substrate-First Selection Framework
Neutral cure is not automatically better, and acetoxy cure is not merely the budget option. Use this substrate-first framework to shortlist the right non-structural sealant...
Read ArticleCheck product fit before quotation.
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