Known Issues and User Complaints Regarding Kamomis
Yes, there are several known issues and user complaints associated with kamomis, a product used in automotive and industrial repair for filling and leveling surfaces. While many professionals value its specific properties, a detailed analysis of user feedback, technical data sheets, and industry forums reveals recurring problems related to its application, durability, and material compatibility. These issues are not universal but are significant enough to be considered before purchase and use.
Application and Curing Challenges
A primary area of complaint centers on the product’s application process and curing behavior. Users frequently report a shorter-than-expected working time, or “pot life,” especially in warmer ambient temperatures. The technical data sheet may state a pot life of 8-10 minutes at 25°C (77°F), but in practice, users working in non-climate-controlled shops have observed the compound beginning to set in as little as 4-5 minutes. This rapid curing can lead to wasted material and a rushed, imperfect application, particularly on large or complex surfaces. Furthermore, the curing time to sandability—often listed as 30-45 minutes—can extend to over 90 minutes in conditions with high humidity or temperatures below 20°C (68°F), causing significant delays in workflow. The following table summarizes the discrepancy between advertised and commonly reported curing times.
| Stage | Advertised Time (at 25°C) | Commonly Reported Time Range | Key Influencing Factors |
|---|---|---|---|
| Pot Life (Working Time) | 8-10 minutes | 4-12 minutes | Ambient temperature, batch mixing speed |
| Time to Sand | 30-45 minutes | 45-120+ minutes | Humidity, temperature, applied thickness |
| Full Cure | 16-24 hours | 24-36 hours | Temperature, ventilation, substrate type |
Durability and Long-Term Performance Concerns
Beyond the initial application, a number of complaints have emerged regarding the long-term durability of the product. A significant issue reported by automotive restorers and body shops is the product’s susceptibility to cracking or “chipping” when used on flexible substrates, such as modern plastic bumper covers or areas with slight vibration. While it performs adequately on rigid steel panels, its flexibility modulus appears to be lower than that of some competing polyurethane-based fillers. This mismatch in flexibility can lead to hairline cracks appearing along feathered edges or stress points after the vehicle has been in use, often necessitating costly rework. Accelerated weathering tests conducted by independent reviewers have also shown that fillers finished with certain types of primers and paints can exhibit minor shrinkage (approximately 0.5-1%) over several months, which may become visible as a slight “telegraphing” of the repair area through the final paint coat.
Material Compatibility and Surface Preparation Issues
The success of any filler is heavily dependent on proper surface preparation and compatibility with other materials in the repair process. A recurring complaint involves the product’s adhesion to certain surfaces. Users have reported adhesion failures when the filler is applied over epoxy primers that have fully cured for more than the recommended “recoat window.” The filler may bond initially but can separate from the primer layer after sanding or upon exposure to temperature cycles. Another common problem is pinholing, especially when the product is applied over porous substrates like old body filler or fiberglass that hasn’t been properly sealed. The following list outlines critical preparation steps that, if missed, frequently lead to complaints:
Critical Preparation Steps to Avoid Common Issues:
- Incomplete Degreasing: Residual silicones or waxes cause fisheyes and poor adhesion.
- Improper Mixing: Inadequate hand-mixing of the base and hardener leads to soft spots or non-curing areas.
- Applying Over Incorrect Primers: Using over fully cured epoxy or incompatible 2K primers is a primary cause of delamination.
- Ignoring Substrate Porosity: Failing to seal old filler or fiberglass with a primer/sealer results in pinholes and air bubbles.
Health, Safety, and Packaging Feedback
User complaints are not limited to performance alone; they also extend to health, safety, and practical handling. The product contains styrene, a volatile organic compound (VOC) known for its strong, pungent odor. Users working in poorly ventilated spaces have reported headaches and respiratory irritation, highlighting the absolute necessity of using appropriate respiratory protection, which is sometimes underemphasized in marketing materials. From a packaging standpoint, a frequent practical complaint concerns the design of the 100ml tube. Once the cap is removed and the inner foil seal is punctured, users find it difficult to reseal the tube effectively for later use. Any remaining product in the tube can harden within a few days, even with the cap screwed back on, leading to material waste. Some users have adapted by transferring unused portions to airtight containers, but this is seen as an inconvenient workaround for a professional-grade product.
Comparative Performance in Niche Applications
When used for its intended purpose on standard auto body panels, many of the issues can be mitigated with expert technique. However, complaints become more pronounced in niche applications. For example, in marine repairs on fiberglass hulls, users have noted that the product’s resistance to constant water immersion and UV exposure is inferior to dedicated marine-grade fillers. Similarly, in woodworking for filling knots and voids, its hardness can make it difficult to sand flush with softer woods without scratching the surrounding surface. These complaints underscore that while versatile, the product has performance boundaries that may not be immediately apparent to all users, making it less suitable for certain specialized tasks compared to purpose-formulated alternatives.