What sealant should I use for sink bonding?

What sealant should I use for sink bonding?
When choosing a sealant for sink bonding, it’s crucial to consider its water resistance, water resistance, mildew resistance, weather resistance, and compatibility with the sink/countertop material. Different scenarios and material combinations require a tailored selection. The following is an analysis of popular sealant types and their applicable scenarios to help you precisely match your needs:
1. Preferred Sealant Type: Silicone Sealant (Most Versatile)
Silicone sealant is the “golden choice” for sink bonding. Its core advantages include excellent water resistance, high and low temperature resistance (-50°C to 150°C), excellent flexibility (preventing cracking caused by thermal expansion and contraction of the sink/countertop), mold resistance, and strong compatibility with popular sink/countertop materials such as stainless steel, ceramic, quartz, and marble.

Based on their functional characteristics, they can be divided into two categories, and the choice should be based on the intended use environment:
1. Neutral Silicone Sealant (Recommended Rating: ★★★★★)
Key Features: Non-corrosive (contains no acid), wide bonding range, and no irritating odor after curing, making it the preferred choice for most applications. Applicable Scenarios:
Sink Materials: Stainless steel, ceramic, and artificial stone (such as acrylic).
Countertop Materials: Quartz, marble, slate, and wood (avoid acidic adhesives that may corrode stone/wood).
Installation Targets: Kitchen sinks (exposed to water and detergents for extended periods), bathroom sinks (moisture can lead to mold).
Note: Neutral adhesive cures slightly slower (typically tack-drying in 24 hours and fully curing in 72 hours). Allow ample drying time after application to avoid premature exposure to water.
2. Acidic Silicone Sealant (Use with caution, suitable for specific applications)
Key Features: Fast curing (tack-drying in a few hours), slightly stronger adhesion than neutral adhesive, but contains acetic acid, which releases a pungent odor during curing. It also poses a risk of corrosion to metals (such as aluminum countertops) and natural stone (such as marble and granite), potentially causing discoloration and oxidation. Suitable for: Recommended only for stainless steel sinks and stainless steel countertops (bonding to the same materials to avoid corrosion), and ensure the installation environment is well-ventilated to disperse odors.

Contraindications: Absolutely not suitable for stone, aluminum, or wooden countertops. Also not recommended for use in humid, enclosed kitchen environments (where odors are difficult to disperse).

II. Additional Options for Special Scenarios
1. Anti-mold Silicone Sealant (Essential for Humid Environments)
Core Improvement: This sealant, enhanced with an anti-mold ingredient, inhibits the growth of mold and bacteria. It’s particularly suitable for mold-prone areas like bathroom sinks (which are constantly damp) and under kitchen sinks (which are dark and prone to water accumulation).