Applying linseed oil putty, especially for window glazing, involves preparing the surface and using a putty knife to press the material gently into place along the edge.
Applying linseed oil putty correctly ensures a weather-tight seal and a neat finish, particularly around window panes. The process typically involves preparing the surface, applying the putty, and tooling it smooth.
Surface Preparation is Key
Before applying linseed oil putty, ensure the surface is clean, dry, and free from loose paint, old putty, or debris. For window glazing, the frame should be ready, and the glass pane should be securely held in place, often with glazing points or sprigs.
Applying the Putty
The application method is crucial for achieving a good bond and seal.
Here’s a general approach:
- Prepare the Putty: Knead the putty in your hands until it is pliable. If it's too stiff, a tiny amount of linseed oil can be kneaded in, but be careful not to make it too oily.
- Initial Application: Roll a length of putty into a 'sausage' shape. Press this firmly into the rebate (the groove or edge where the glass meets the frame).
- Bedding the Glass (if applicable): If glazing a window, you may apply a thin layer of putty into the rebate before placing the glass. This is called 'bedding'.
- Forming the Bevel/Fillet: This is where the main visual layer of putty goes on the outside of the window. Take another piece of kneaded putty and press it firmly against the glass and the frame edge.
- Tooling with a Putty Knife: Using a putty knife or glazing tool held at an angle (usually around 45 degrees), carefully smooth the putty. The goal is to create a clean, angled bead (fillet or bevel) that is flush with the frame on one side and tapers thinly onto the glass on the other.
Important Insight from Reference: When tooling the putty, don't mash the putty into the groove. Instead, gently press as your putty knife travels along the edge of the window frame. It's okay if the initial application is a little messy; the tooling process is what creates the final, clean line.
Finishing Touches
- Trim away any excess putty that squeezes out.
- Wipe the glass clean immediately using a cloth dipped in a little mineral spirits to remove any oil residue before it hardens.
- Allow the putty to skin over before painting (this can take days or weeks, depending on temperature and humidity). Once skinned but not fully hardened, it can be painted with a compatible paint (typically oil-based paint is recommended).
Practical Tips
- Angle Matters: The angle of your putty knife determines the slope of the putty bead. Practice to get a consistent angle.
- Consistent Pressure: Apply steady, gentle pressure as you tool to create an even bead.
- Work in Sections: It's often easier to apply and tool sections of putty rather than trying to do a whole side at once.
- Clean Tools: Keep your putty knife clean during the process for the best results.
By following these steps, focusing on gentle and steady pressure during tooling as highlighted, you can successfully apply linseed oil putty for durable and attractive results.
