PVC TrimWelder™ Fill Flex

1 of 9 products in this brand

PVC TrimWelder™ Fill Flex offers outstanding flexibility and adhesion to PVC and was specially formulated to be used for expansion and contraction joints on PVC lumber and trim board. PVC TrimWelder™ Fill and Flex™ non-sag consistency is ideal for most vertical applications. It also works as a weather barrier for sealing windows and doors and has excellent gap-filling features.

Product Type1K (1 component) Sealant

Application AreaComposite Industrial Panel, Doors, Joints, PVC Lumber, Panels, Trim Board, Windows

Compatible Substrates & SurfacesPolyvinyl Chloride (PVC)

Chemical FamilySilanes

FeaturesGood Gap Filling Capabilities, Good Non-Yellowing Properties, Good Sagging Resistance, Good UV Resistance, High Flexibility

Technical Data Sheet

Enhanced TDS

Identification & Functionality

Chemical Family
Product Information
Technology / Base One-component sealant
Type of Product Silane sealant
Curing Mechanism Moisture-curing
Appearance / Color Bright white
Consistency Paste

Features & Benefits

Labeling Claims

Applications & Uses

Compatible Substrates & Surfaces
Cure Method
Typical Applications
  • PVC TrimWelder™ Fill & Flex™ was specifically formulated to be used for expansion and contraction joints on PVC lumber and trim board.
  • For use as a filler only. For structural and permanent applications, use either PVC TrimWelder™ Fast Cure or Slow Cure.
  • Contact an H.B. Fuller PVC TrimWelder™ adhesives Applications Specialist for further recommendations on adhesive selection.
Application Instructions

PVC TrimWelder™ Fill & Flex™ comes ready-to-use. Cut the tip to the desired bead size. Break the seal inside the nozzle and use a standard caulking gun to dispense. PVC TrimWelder™ Fill & Flex™ may take several days to cure depending on temperature and humidity.


Physical Form
Cured Properties
ValueUnitsTest Method / Conditions
Hardness40.0Shore A
Coverage32' x 1/4" (120' x 1/8")inches
Uncured Properties
ValueUnitsTest Method / Conditions
Specific Gravity (at 20/20°C)1.06
Flash Point170.0°FPensky-Martens CC
Clean Up SolventsMEK, Acetone

Packaging & Availability

Country Availability
Packaging Type
Regional Availability
  • USA
Packaging Information

Typically sold in 300 mL cartridges.

Storage & Handling

Shelf Life
12 Months
Storage & Shelf Life

Store in an unopened original container in a cool, dark area between 55°F to 75°F. Avoid moisture and water since this product is a moisture-curing material.