U-Pol Top Stop Smooth Finishing Stopper - 750ml
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Product Information
Full details
The U-Pol Top Stop 750ml finishing stopper is designed for professional automotive body technicians and serious DIY enthusiasts who require a flawless surface before applying paint. Its primary benefit is its ultra-smooth, pinhole-free finish that saves hours of labor during the sanding and priming process; however, users should be aware that it has a relatively fast curing time, necessitating efficient application before it hardens.
All features
| Model Part Number | UPTOP/M |
|---|---|
| Brand | U-Pol |
Extended Product Information
FAQs
Can I use this over bare metal?
Yes, but for optimal long-term results, ensure the metal is scuffed and free of any rust or contaminants.
Is this a structural filler?
No, this is a finishing stopper designed for surface imperfections, not for filling deep dents or structural repairs.
What grit sandpaper should I start with?
After applying, start with 180-grit to level, then follow up with 320-grit for a smooth finish prior to painting.
How long does it take to cure?
Typically, it is ready to sand in 20-30 minutes, depending on the ambient temperature.
Can this be applied over existing paint?
Yes, as long as the paint is sound, fully cured, and thoroughly scuffed to provide a mechanical key for adhesion.
Troubleshooting
The stopper is not hardening
Insufficient hardener was added; ensure you use a consistent ratio and thoroughly mix the components until a uniform color is achieved.
Pinholes appearing after sanding
Ensure the surface was wiped clean with degreaser before application and apply more pressure during the initial swipe to force the stopper into minor surface imperfections.
Stopper is tearing while sanding
The product has not fully cured; allow for more time before sanding or ensure your environment is not too cold.
Pros and Cons
Pros
- Dries to a very smooth, consistent texture
- Highly resistant to pinholes common in lesser fillers
- Compatible with a wide range of automotive substrates
- Rapid curing speeds up repair turnaround times
Cons
- Short work window requires fast application
- Requires precise mixing with hardener to ensure proper cure
- Not intended for filling deep dents or structural damage
Setup, Compatibility & Care
To use U-Pol Top Stop, ensure the substrate is cleaned with a degreaser and sanded to remove rust or oxidation. Mix the filler with the provided hardener on a non-porous mixing board using a plastic spreader; a standard ratio is roughly 2% hardener by weight. Apply the mixture firmly to ensure good adhesion, keeping layers thin to prevent cracking. Once cured, sand within 20-30 minutes. Store the container in a cool, dry place away from direct sunlight, and always ensure the lid is tightly sealed to prevent the solvent from evaporating and hardening the contents prematurely.