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 is a focused route for confirmed granite countertop installation, undermount sink bonding and sealing, compatible glass, glazed tile and selected 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
Focused option for confirmed granite countertop installation and undermount sink bonding/sealing with compatible stainless-steel sink rims, plus compatible glass, ceramic tile and selected non-porous details.
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
- Granite countertop installation
- Undermount sink bonding and sealing
- Bathroom basins, vanities and splash zones
- Compatible glazed-surface repair details
Common substrates
- Ceramic tile and porcelain
- Glass and glazed surfaces
- Granite countertops
- Compatible stainless-steel sink rims
- 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 for the confirmed granite countertop and sink-rim route after checking the actual stone finish, sink finish, adjacent materials and support method. This scope does not automatically extend to marble, limestone, travertine or every natural-stone joint.
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 for a granite undermount sink?
EX230 has a confirmed application scope for granite countertop installation and undermount sink bonding/sealing with compatible stainless-steel sink rims. Confirm the actual stone and sink finishes, adjacent materials and mechanical support method; the silicone is not the sole support for the sink.
Can EX230 be used on every bathroom surface?
No. EX230 is an acetoxy silicone for its confirmed granite countertop and sink-rim route plus compatible glass, tile and selected non-porous surfaces. Marble, limestone, travertine, sensitive metals, mirrors, concrete and alkaline substrates require separate compatibility review 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.
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Vesta Insights
Technical Insights
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Read ArticleCheck product fit before quotation.
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