Sika 483503 PostFix Fence Post Mix, Expanding Foam, 33 oz.

Sika PostFix Fence Post Mix is a two-part, pre-proportioned polyurethane resin that mixes in the bag to create an expanding foam. It eliminates the need for traditional concrete bags, offering a faster, easier way to set fence posts, mailbox posts, gate posts, signage, and other in-ground supports without requiring water or special tools.

This high-strength expanding foam formulation is designed for both professional contractors and homeowners tackling DIY projects. One 33 oz container can set multiple posts, replacing the need for two 50 lb bags of concrete mix. Simply roll the bag to mix the two components, then pour the foam around your post.

Features and Benefits

• Two-Part Polyurethane Resin: Pre-proportioned components ensure proper mixing without measuring or guessing.
• Mix-In-The-Bag Application: Roll and shake the sealed bag to activate the foam; no additional water, tools, or concrete mixer required.
• Versatile Post Support: Works with wood, PVC, steel, and concrete posts for fences, mailboxes, gates, signs, and other installations.
• Lightweight Expanding Foam: The foam expands to fill voids and provide structural support while remaining easier to handle than heavy concrete.
• High-Strength Backfill: Delivers strong support for in-ground posts without the weight and labor of traditional concrete.
• Low-VOC Compliant: VOC-compliant formulation meets environmental standards across all 50 states.

Specifications

• Brand: Sika
• Model: 483503
• Size: 33 oz
• Type: Two-component polyurethane resin expanding foam
• Suitable For: Wood, PVC, steel, and concrete posts
• Applications: Fence posts, mailbox posts, gate posts, signage supports, and general in-ground backfilling
• VOC Status: Low-VOC, compliant in all 50 states
• Package Dimensions: 18.5 x 9.75 x 9.5 inches
• Weight: 2.55 lb per container