Description
Berger-Seidle AquaSeal® Flex Fill Color – 10.5 oz
This is the filler we reach for when gaps, transitions, and edges need to move with the floor—and still look right after finish goes down.
Berger-Seidle Flex Fill Color is a premium, color-matched acrylic gap filler engineered specifically for hardwood flooring work. Available in strategic, natural wood-tone colors, it blends convincingly with common hardwood species, stains, and even tile or mortar transitions—making it one of the most believable color-match fillers available.
Its silicone-free, solvent-free formula delivers excellent adhesion and long-term elasticity, allowing it to expand and contract with seasonal wood movement instead of cracking or pulling loose. Flex Fill Color is ideal for closing stubborn gaps between boards, refining edges next to tile or metal, repairing unfinished perimeters, or correcting unresolved gaps before or after refinishing.
With its strong bonding ability, it can even function as a light-duty adhesive when needed.
Why contractors use Flex Fill Color
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Color-matched wood tones – Blends naturally, not clear or plastic-looking
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Highly elastic – Moves with the floor through seasonal change
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Strong adhesion – Can double as a light-duty adhesive
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Silicone-free & solvent-free – No finish rejection or fisheyes
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Fully top-coatable – Compatible with all waterborne and oil-based finishes
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Works on finished or unfinished floors – Before or after refinishing
Best used for
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Gaps between boards
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Perimeter and unfinished edges
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Tile, metal, and threshold transitions
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Small voids and movement joints
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Cleanup of gaps that weren’t solved during sanding
Application Notes
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Fits any standard 10.5 oz caulk gun
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Dry time and coverage depend on gap size
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For long, consistent beads, high-ratio caulk guns provide smoother control
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Tool smooth, allow to dry, then coat normally
Once coated, Flex Fill Color integrates cleanly with the surrounding floor—no clear lines, no flashing, no surprises.
Dustin’s Notes
Most caulks either don’t move enough or don’t look right once finish is on. Flex Fill Color does both. It stays elastic, accepts finish without issues, and the colors actually make sense on real floors. I use it wherever movement is expected but aesthetics still matter.
Key Specs
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Size: 10.5 oz cartridge
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Type: Acrylic, silicone-free gap filler
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Odor: None
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Finish compatibility: All commercial wood floor finishes
Logistics
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Same-day shipping available
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Freeze-protection packaging in cold weather
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Local pickup in Saint Paul, MN