Yes, you absolutely can put slip on leather-hard clay, and according to the provided information, it works best at this stage.
Applying slip to clay pieces is a common technique used for decoration, changing surface color, or adding texture. While slip can be applied at different stages of dryness, the leather-hard stage offers significant advantages.
Why Leather-Hard Clay is Ideal for Slip Application
The reference material explicitly states: "The slip application works best on leather-hard clay." This stage of dryness, where the clay is firm but still holds enough moisture to allow for good adhesion without excessive shrinkage or cracking, is considered optimal.
Here's why leather-hard is preferred:
- Optimal Adhesion: The clay is dry enough to handle without deforming but still porous enough to absorb the slip evenly, creating a strong bond.
- Reduced Risk of Damage: Unlike wet clay, a leather-hard piece is sturdy enough to withstand the application process.
- Even Coverage: Slip tends to dry more uniformly on a leather-hard surface compared to bone-dry clay, which can absorb too quickly, or wet clay, which can lead to smearing.
How to Apply Slip to Leather-Hard Clay
The reference provides a specific method for applying slip at this stage:
- Tool: Use a hake brush for application.
- Consistency: The slip should have the consistency of heavy whipping cream. This ensures it flows smoothly but isn't too watery.
- Application: Apply a moderate coat of slip to the surface. Avoid making the layer too thin or too thick.
Applying slip correctly at the leather-hard stage helps prevent common issues like peeling, cracking, or crawling during drying and firing.
