FAQs

Depending on the application (topcoat, midcoat, primer), system type (solvent-based, solvent-free, water-based), and performance requirements (gloss, hardness, working time), please contact our technical team for recommendations.

You can choose low-odor products, such as G-TD1939 (polyetheramine type, low odor, long operation time) or G-WM1660 (water-based system, extremely low odor).

Some of the curing agents can be diluted with water (in a water-based system) or with a dedicated diluent (in a solvent-based system). However, it is important to note that the dilution ratio should not be too high, as this may affect the curing performance. For specific details, please refer to the product TDS.

The following methods can be used to make a simple judgment: Test the hardness value with a pencil hardness tester to see if it meets the standard; Wipe the surface of the paint film with MEK or acetone. If it becomes soft or changes color, it indicates incomplete curing; Press with your finger lightly without leaving any marks, which means it has dried on the surface. The epoxy floor is a site-based construction. The polyetheramine system reacts at 40-45℃ and approximately 60% of the reaction is completed. The remaining part is continuously improved through the subsequent curing period, which is a normal phenomenon.

The root cause of sandability problems in solvent-based intermediate coats lies in the imbalance between surface dry and through dry. If the curing agent dries too quickly on the surface, the film layer seals itself rapidly, trapping solvents inside and leading to false drying and sandpaper clogging. The solution is to select a curing agent with a longer surface dry time (pot life ≥40 minutes, surface dry time controlled at 3-4 hours or longer). Phenalkamine curing agents are the preferred recommendation for low-temperature environments.

Orange peel/brush marks are caused by poor leveling or too short a pot life — choose a curing agent with good leveling properties. Cratering/fisheyes are caused by substrate oil contamination — thoroughly clean the substrate. Bubbles/pinholes are caused by insufficient bubble removal or excessive film thickness — ensure proper deaeration and control single-coat thickness. Whitening/hazing are caused by high humidity or poor compatibility — control the construction environment humidity. Choosing a stable-quality curing agent and following standard application practices can effectively prevent these issues.

Solvent-free intermediate coat systems (100% solids content) require long pot life, low initial viscosity, and complete curing. Blended amine systems — combining polyetheramines, cycloaliphatic amines, and accelerators — offer a balanced combination of low viscosity, adjustable pot life, and good drying performance. They achieve the ideal balance of “long pot life with rapid curing once gelation occurs,” making them the current mainstream solution for high-performance solvent-free intermediate coats.