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Stanley S421 RTV Silicone Caulk Clear (12 x 10.1 fl.oz.) - 100% Waterproof Industrial-Grade Silicone for Kitchen, Bathroom, Shower, Window, Door, Indoor & Outdoor Use
✅ In stock
D
Grade
Analysis Confidence
90%
⚠️ Price may have changed. Last updated 24+ hours ago — confirm on Amazon.
Check Deal at Amazon
Price verified Sep 22, 2026 5:47 PM · Prices & availability subject to change
Is This a Good Price on Amazon?
😐 Weak Deal- 😐Verdict: Weak Deal. Marginal discount. Prices may drop further soon.
- 💰The price is modestly below what this product ordinarily sells for.
- 🏷️The listed retail price is trimmed by 14% at checkout.
- 📉Pricing has not dipped this low in roughly six months, placing this offer among the better deals in that window.
- ➡️Pricing has held fairly steady, with no strong push in either direction.
How We Scored This Deal
Price Competitiveness
3.92/28
Recent Value
1.92/22
Market Standing
10.42/20
Deal Strength
10/20
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.
⚙️ Specifications
Color
Clear
Brand
STANLEY
Item Weight
10.1 ounces
Liquid Volume
10.1 Fluid Ounces
Full Cure Time
24 Hours
Item Form
Liquid
Surface Recommendation
Window
Water Resistance Level
Waterproof
Number of Items
12
Manufacturer
StanleyChem
UPC
810125461071
