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Can I put new silicone over old?

Silicone sealing is a common practice in various household and industrial applications, providing excellent waterproofing and sealing properties. Over time, however, silicone may degrade or become damaged, necessitating resealing to maintain its effectiveness. One question frequently asked is whether it’s possible to put new silicone over old.


Silicone sealing plays a crucial role in preventing leaks and providing insulation in many areas, including bathrooms, kitchens, and automotive applications. However, as silicone ages, it may lose its elasticity or develop cracks, compromising its sealing capabilities. In such cases, resealing becomes necessary to maintain the integrity of the seal and prevent potential water damage or air leaks.

Understanding the Need for Resealing

Before delving into the process of putting new silicone over old, it’s essential to understand why resealing may be required. Over time, environmental factors such as exposure to sunlight, moisture, and temperature fluctuations can degrade silicone, leading to deterioration. Additionally, physical damage or improper installation can also contribute to the deterioration of silicone seals.

Factors to Consider Before Resealing

Before deciding to put new silicone over old, several factors need to be considered. Firstly, assess the condition of the existing silicone. If it’s severely degraded, it’s advisable to remove it entirely before applying new silicone. Secondly, ensure that the new silicone is compatible with the old one to achieve proper adhesion and sealing.

Steps to Put New Silicone Over Old

If the existing silicone is in good condition and adhering well to the surface, it’s possible to put new silicone over it. Here’s a step-by-step guide:

  1. Preparation: Clean the surface thoroughly to remove any dirt, grease, or residue.
  2. Removal of Old Silicone: Use a silicone remover or a razor blade to carefully remove any loose or damaged silicone.
  3. Cleaning the Surface: Wipe the area with a suitable cleaner to ensure it’s free from any contaminants.
  4. Applying New Silicone: Use a caulking gun to apply the new silicone evenly along the seam or joint, ensuring complete coverage.

Tips for a Successful Resealing Process

  • Ensure proper ventilation when working with silicone sealants.
  • Use masking tape to create clean, straight lines before applying silicone.
  • Smooth the silicone bead with a finger or a tool dipped in soapy water to achieve a neat finish.

Common Mistakes to Avoid

  • Applying silicone over dirty or wet surfaces.
  • Using incompatible silicone types that may not adhere properly.
  • Overlooking proper surface preparation, leading to poor adhesion.

Benefits of Resealing with New Silicone

Resealing with new silicone offers several benefits, including improved waterproofing, enhanced durability, and a fresh, clean appearance. Additionally, it helps prolong the lifespan of the seal and prevents potential leaks or damage.


In conclusion, putting new silicone over old is a viable solution for maintaining and extending the lifespan of silicone seals. By following proper preparation and application techniques, it’s possible to achieve a reliable and long-lasting seal that effectively prevents leaks and provides insulation.


  1. Can I apply new silicone directly over old silicone?
    • Yes, as long as the old silicone is in good condition and properly adhered to the surface.
  2. How do I know if the new silicone is compatible with the old one?
    • Check the manufacturer’s specifications and recommendations for compatibility.
  3. Is it necessary to remove all of the old silicone before applying new silicone?
    • It’s advisable to remove any loose or damaged silicone to ensure proper adhesion of the new sealant.
  4. How long does silicone take to cure?
    • Silicone typically cures within 24 hours but may vary depending on environmental conditions such as temperature and humidity.
  5. Can I paint over silicone sealant?
    • While some silicone sealants are paintable, it’s essential to check the manufacturer’s instructions and recommendations before painting.
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