Weatherproof Silicone Sealant

Prep the Surface Properly
Cleanliness is key when working with silicone sealants. Remove dust, grease or old residue from the application area using a mild detergent or isopropyl alcohol. For best results, ensure surfaces are dry before applying the sealant.

Choose the Right Product for the Job
There are multiple types of silicone sealants designed for different applications. For example, acetoxy-cure variants work wonders on ceramics and glass but release a vinegar-like smell. Neutral-cure silicone adhesives are better for metals and plastics.

Use Proper Application Techniques
Cut the Nozzle Correctly: Trim the applicator nozzle at a 45° angle to control bead size.
Apply Even Pressure: Squeeze the cartridge smoothly to create a consistent bead.
Tool the Sealant: Use a spatula or your finger (dipped in soapy water to prevent sticking) to smooth the sealant into joints.
Astral Tip: For vertical surfaces, apply from the bottom up to prevent sagging.

Allow Adequate Curing Time
Silicone adhesives cure via exposure to moisture in the air. Avoid disturbing the sealant for at least 24 hours, even if it feels dry to the touch. Full curing can take up to 48 hours, depending on humidity and thickness.

Store Unused Sealant Glue Correctly
Reattach the nozzle and store the cartridge in a cool, dry place. For partially used tubes, puncture the seal with a nail to prevent air exposure, which can harden the remaining product.

Don’t Skip Compatibility Checks
Silicone’s non-porous surface prevents paint adhesion, unlike water-based sealants. It refuses to stick to polyethylene (PE), polypropylene (PP) or Teflon. Avoid using it on natural stone without a primer, as acids in silicone can stain surfaces.

Don’t Rush the Job
Hastily applied silicone sealant glue leads to air bubbles and weak bonds. Work slowly, especially in tricky corners.

Don’t Overapply
More is not always better. A 3–6mm bead suffices. Excess silicone sealant is harder to smooth and wastes product.

Don’t Ignore Safety
Wear gloves to avoid skin irritation. Work in ventilated areas to dodge fumes and keep silicone adhesives away from children.

Don’t Use Expired Products
Old silicone glue may harden or fail. Check expiry dates and discard lumpy or discoloured cartridges.

Don’t Paint Over Silicone
Most silicone sealants resist paint. Opt for paintable acrylic or latex if a coloured finish is needed.