How to use MS sealant
How to use MS sealant
Core Steps: 4-Step Standard Procedure
Step 1: Surface Preparation (Critical! Directly Affects Adhesion)
The sealant’s effective adhesion relies on a clean, dry, and impurity-free substrate surface. The following steps should be followed:
Removing Old Sealant/Impurities: If there is old sealant, dust, or oil on the substrate, first remove the old sealant with a utility knife, then wipe away loose dust with a dry rag.
Degreasing and Deoiling: Use a rag dampened with alcohol or acetone to repeatedly wipe the substrate surface (especially smooth surfaces like metal, plastic, and stone) to remove oil, mold release agents, and other contaminants to prevent sealant from sticking.
Roughening (Optional): If the substrate is smooth plastic (such as PVC) or metal, lightly sand the surface with 120-grit sandpaper to increase the roughness. (Note: Sanding is not necessary on stone or glass to avoid scratching.)
Drying: Ensure the substrate surface is completely dry (free of moisture and alcohol residue). Humid conditions will prolong the curing time and may even cause debonding. Step 2: Glue Application Preparation (Positioning and Nozzle Treatment)
Cut the nozzle: Cut the nozzle according to the gap width (for gaps ≤ 10mm, the nozzle diameter should be 1-2mm wider than the gap; for gaps > 10mm, the nozzle diameter should be the same as the gap width). A 45° cutting angle is recommended to ensure a smooth fit during application.
Glueing and Venting: Load MS sealant into the gun, push the gun plunger until it rests against the bottom of the hose, then gently depress the gun trigger to expel any air from the hose (until a uniform flow of sealant is achieved without bubbles).
Applying Masking Tape (Optional, for Enhanced Aesthetics): If the area to be sealed is surrounded by easily contaminated materials (such as latex paint on walls or painted wooden doors), apply masking tape on both sides of the gap (2-3mm from the edges). Remove quickly after application to avoid residual glue marks. Step 3: Glue Application (Control Speed and Thickness)
Glue Application Angle: Hold the glue gun at a 45-60° angle between the nozzle and the substrate surface. Place the nozzle against the bottom of the gap to ensure the glue completely fills the gap (avoiding hollows).
Glue Application Speed: Push the trigger of the glue gun at a steady speed of 10-15 cm/s (adjust according to the gap width, applying slower for narrow gaps and faster for wider gaps). Ensure a continuous, seamless glue application.
Glue Layer Thickness: A typical glue layer thickness of 3-5 mm is recommended (for gap widths < 5 mm, the glue layer thickness equals the gap width; for gap widths > 5 mm, the glue layer thickness should not exceed 5 mm to prevent shrinkage and cracking during curing). Step 4: Curing and Curing (Avoid Interference and Inspection)
Surface Dry Time: MS sealant will dry to the touch in approximately 1-2 hours at room temperature (23°C ± 2°C, 50% ± 5% humidity). Avoid contact with water or dust during this time.
Full Curing Time: Full curing takes 7-14 days at room temperature (approximately 7 days for a 3mm thickness, approximately 14 days for a 5mm thickness). Low temperatures (<10°C) or high humidity (>80%) will prolong the curing time. It is recommended to verify full cure by pressing the surface of the sealant to ensure no dents are visible.
Post-Cure Inspection: After full cure, inspect the sealant for cracks, debonding, or bubbles. If localized defects are present, remove the defective area and repair according to the “Surface Preparation → Gluing” process.