Stanley S421 RTV Silicone Caulk Gray (48 x 10.1 fl.oz.) - 100% Waterproof Industrial-Grade Silicone for Kitchen, Bathroom, Shower, Window, Door, Indoor & Outdoor Use

STANLEY

Stanley S421 RTV Silicone Caulk Gray (48 x 10.1 fl.oz.) - 100% Waterproof Industrial-Grade Silicone for Kitchen, Bathroom, Shower, Window, Door, Indoor & Outdoor Use

Name: Stanley S421 RTV Silicone Caulk Gray (48 x 10.1 fl.oz.) - 100% Waterproof Industrial-Grade Silicone for Kitchen, Bathroom, Shower, Window, Door, Indoor & Outdoor Use
Brand: STANLEY
SKU: B0FW5J22HN
Price: 102.99 USD
Availability: InStock

✅ In stock

Grade

💤 Not a Deal

17.22/100

Current Price

$102.99

Listed $9.87

Analysis Confidence 90%

⚠️ Price may have changed. Last updated 24+ hours ago — confirm on Amazon.

Check Deal at Amazon

Price verified Sep 22, 2026 8:20 AM · Prices & availability subject to change

Is This a Good Price on Amazon?

💤 Not a Deal

💤Verdict: Not a Deal. Price is at or above historical norms. Best to wait for a sale.
💰The price is modestly below what this product ordinarily sells for.
📉Better-priced windows have occurred before, though not frequently — today's price is reasonably competitive.
➡️Pricing has held fairly steady, with no strong push in either direction.

How We Scored This Deal

Price Competitiveness 2.6/28

Recent Value 0/22

Market Standing 10.63/20

Deal Strength 0/20

Momentum 4/10

📝 Product Overview

🏪 Sold by Stanley Chemicals

🚚 Shipping Free Shipping

Product Details

✓100% Silicone Sealant for Long-Lasting Sealing: Formulated with pure silicone for exceptional elasticity and durability. Ideal for sealing joints and gaps on windows, doors, kitchens, bathrooms, and more.

✓WATERPROOF BATHROOM & KITCHEN CAULK: Create a secure seal around showers, bathtubs, sinks, countertops and other moisture-prone areas. This waterproof silicone sealant works as bathroom caulk, shower caulk and bathtub caulk, helping prevent water from entering joints and gaps exposed to splashes, humidity and frequent cleaning.

✓FLEXIBLE SEAL THAT MOVES WITH THE JOINT: Unlike rigid fillers, the cured silicone caulk maintains elasticity as joints expand, contract or experience normal movement. Its flexible finish helps reduce cracking, shrinking and separation over time, making this RTV silicone sealant a reliable choice for areas affected by temperature and environmental changes.

✓MULTI-SURFACE ADHESION FOR CLEAN RESULTS: Designed to bond effectively to glass, ceramic, porcelain, enamel, aluminum, stainless steel and coated wood. This all-purpose silicone sealant supports clean, professional-looking caulking around fixtures, frames and connecting surfaces when applied to properly prepared, dry and contaminant-free areas.

✓INDOOR & OUTDOOR SEALING APPLICATIONS: Use this weather-resistant silicone sealant around windows, doors, kitchens, bathrooms and exposed non-porous joints. Suitable for residential, commercial and general construction use, it provides a durable barrier against water, humidity and changing weather while retaining long-term flexibility.