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Silicone Sealant vs Acrylic Sealant

What is silicone sealant?

Silicone sealants are based on silicone polymers and cure to form a tough flexible rubber suitable for both household and industrial applications. The three main types of silicone sealant are; acetoxy cure which are acetic acid curing recognised by their vinegar like smell, alcoxy cure and oxime cure both of which are neutral curing. Acetoxy cure are most commonly used for internal applications whereas the neutral curing silicones are used externally due to their superior adhesion and weatherproofing properties. In addition neutral curing silicones are used on surfaces sensitive to acetic acid.

What is acrylic sealant?

Acrylic sealants are based on acrylic polymers and are recognised by several other names including decorators caulk, painters caulk or decorators acrylic. They are traditionally used as an economical filler and sealant mainly internally however some can be used externally.

Silicone Sealant vs Acrylic Sealant

The one advantage acrylic sealant has over silicone sealant is paintability most acrylic sealants are paintable with most paints this is not the case for silicone sealants. However in all other areas silicone sealants outperform acrylic sealants. Silicone sealants are more flexible and have a longer lifespan than acrylic sealants. In addition when applied externally acrylic sealants are ruled by the climate, conditions must be dry and preferably warm to avoid the curing sealant being washed out of the joint. Also silicone sealants are easier to tool and finish compared to their acrylic counterparts. Once the sealant is cured an acrylic sealant's weather resistance and weatherproofing properties does not come close to that of a silicone sealant. Overall if an application is external and a paintable sealant is required we would always recommend the use of the Idealseal Auto-Marine or the Idealseal MS290 rather than using an acrylic sealant.

silicone sealant vs acrylic sealant