Silicone sealant is an indispensable material for achieving a durable and effective seal. However, to ensure an optimal result, it is essential to know the right techniques and pay special attention to surface preparation. In this guide, we will delve into how to apply silicone sealant, key steps for its proper drying, and techniques for spreading it professionally.
Why surface preparation is crucial
Before putting on silicone, it is essential that the surface be clean, dry and free of contaminants such as dirt, grease or rust. These elements, in fact, can compromise the adhesion of the sealant, reducing its effectiveness. Even the best technique for applying silicone sealant would be ineffective without proper preparation.
Steps of surface preparation to apply silicone sealant
As mentioned earlier, before fully understanding how to apply silicone sealant, it is essential to properly prepare the application surface to make it suitable for treatment. Surface preparation includes several steps that allow the surface to be treated effectively and optimally:
- Remove dirt: use a dry, oil-free cloth to remove dust and debris.
- Degrease: apply a solvent such as isopropyl alcohol (IPA) or methyl ethyl ketone (MEK) to remove oils and grease. Avoid common detergents, which can leave residue.
- Abrade difficult surfaces: for materials such as rubber or metal, light abrasion with sandpaper improves adhesion.
- Dry the surface: after cleaning, make sure the surface is completely dry. Residual moisture may affect the adhesion of the silicone sealant.
How to apply silicone sealant: techniques and tips
Choose a silicone suitable for your application. DOWSIL™ silicone-based sealants are an excellent choice because of their quality and versatility.
Specific preparation of surfaces by coating primers
The ideal technique begins with deep cleaning using appropriate solvents, followed by the application of coating primers such as those branded DOWSIL™. These products significantly improve the adhesion of the silicone sealant. After cleaning, carefully apply silicone sealant requires a ready surface: apply a thin coat of coating primer by rubbing, dipping or spraying, removing excess to avoid a white, chalky appearance. When applying by dipping, thin the primer to achieve an even layer. For those wondering how long silicone takes to dry, the coating primer cures in 5 to 30 minutes at room temperature and normal humidity.
Technique for spreading silicone sealant and drying time
Once the surface is prepared, it is time to put on the silicone. The technique for spreading the silicone requires precision: apply the silicone sealant along the joint and work it in with a round-pointed trowel. This step helps spread the silicone evenly, eliminating air pockets that can compromise adhesion. As for how long it takes silicone to dry, the time varies: the sealant forms a surface film in 5-10 minutes and dries about 3 mm in 24 hours at room temperature with 50 percent relative humidity. However, in deeper sections or in low humidity environments, the time may be longer. To dry silicone sealant optimally, it is essential to keep the container closed when not in use, preventing the product from curing prematurely.
Final tips on how to apply silicone sealant
If you need to work with silicone sealants on different surfaces, such as metal, glass or ceramic, be sure to follow all the preparatory steps. The key to a perfect application is to spread the silicone carefully and work it in quickly before the surface film forms.
Mistakes to avoid when applying silicone
- Do not dry the surface: Applying silicone to a wet surface can drastically reduce its effectiveness.
- Do not spread the silicone correctly: Spread it evenly to avoid voids or bubbles.
- Waiting too long before applying silicone: After preparing the surface, avoid excessive waiting time, as new contaminants may form
Conclusions
Laying silicone sealant properly requires precision and attention to detail. Preparing the surface, knowing how to put on the silicone, and knowing the drying time are essential elements for a long-lasting sealant. By following these tips and using the right products, you can achieve professional results in any sealing project. If you have any doubts regarding the methods of surface preparation and application of silicone sealants , contact our Mascherpa experts, who will be able to point you to the applications best suited to your case histories or problems.
