U-Pol BPO Hardener - Red - 40g
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Product Information
Full details
The U-Pol BPO Hardener is designed for professional body shop technicians and DIY automotive enthusiasts who require a reliable, consistent curing agent for polyester body fillers. Its primary benefit is providing a predictable hardening process that results in a durable, sandable finish, though users must be careful to strictly follow the recommended mixing ratios to avoid improper curing or brittle repairs.
All features
| Model Part Number | HRED/L |
|---|---|
| Brand | U-Pol |
Extended Product Information
FAQs
Can I use this hardener with any brand of body filler?
It is designed for polyester body fillers, but it is highly recommended to use it with U-Pol products to ensure guaranteed chemical compatibility and curing rates.
What is the correct mixing ratio?
Always follow the specific instructions on the filler product itself, as ratios can vary by manufacturer and temperature conditions.
Is this product hazardous?
Yes, BPO hardeners are chemicals. Always use in a well-ventilated area and wear appropriate protective equipment like gloves and eye protection.
Does the red color affect the paint finish?
No. Once the filler is cured and sanded, the color is contained within the structure and will be covered by primer and paint, having no impact on the final color of your vehicle.
How long can I store this sachet once opened?
It is a single-use sachet designed to be used in its entirety. Once opened, exposure to air can degrade the catalyst.
Troubleshooting
Filler is not hardening even after 30 minutes
The ratio of hardener to filler was likely too low or the ambient temperature is too cold. Scrape away the uncured material and reapply with a slightly higher ratio of hardener in a warmer environment.
Filler hardened too fast before application
You used too much hardener. For the next batch, reduce the amount of hardener added to the filler base.
Red streaks remain in the cured filler
This indicates improper mixing. Ensure you are folding and pressing the filler with a spreader until the color is completely consistent.
Pros and Cons
Pros
- High level of reliability for automotive repairs
- Easy to identify streak-free mixing due to red pigmentation
- Compact 40g sachet size minimizes waste
- Compatible with a wide range of standard polyester fillers
Cons
- Requires precise measurement for best results
- Single-use sachet may be inconvenient for large-scale multi-day projects
- Sensitizing chemical agent requiring proper handling
Setup, Compatibility & Care
To ensure proper performance, store the hardener in a cool, dry place away from direct sunlight, as excessive heat can degrade the chemical efficacy over time. The U-Pol BPO Hardener is specifically formulated for use with polyester-based fillers; avoid mixing with epoxy or urethane products, as they are not chemically compatible. Always wear nitrile gloves during application to prevent skin contact. After use, ensure the sachet or the cap area (if applicable) is wiped clean to prevent contamination. If you are working in cold temperatures, note that curing times will be significantly slower; move to a climate-controlled area if possible.