Lanco Siliconizer Ultra White Elastometric crack Filler smooth Finish grade RC230-4 – 1 Gallon
EC$144.00
Lanco® Siliconizer Crack Filler™ is a flexible, silicone-modified elastomeric mastic designed to seal leaks and fill cracks on smooth surfaces. Its durable, weather-resistant formula provides strong adhesion and helps prevent cracking, peeling, and crumbling.
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Returns & Delivery
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Lanco Siliconizer Ultra White Elastomeric Crack Filler (RC230‑4) is a premium, 100% elastomeric, silicone‑modified styrene/acrylic mastic designed to permanently seal leaks and bridge cracks on smooth interior and exterior surfaces.
Its thick, knife/spatula grade consistency allows it to fill deep cracks and holes without sagging, making it ideal for roofs, walls, around penetrations, flashing, and expansion joints.

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