Caulking and Sealants!

Everything you need to know about Caulking and Sealants! (Part 1)


Caulking vs. sealants


What are Caulking and Sealant and how could be applied?

Caulking and Sealants are both waterproof fillers which mainly used to fill the joints that exist between surfaces. Whether the seam is a Construction Joint or a crack, choosing a proper Caulking or Sealants is important for a safe and durable operation of filler. In fact, application of the filler (for what purpose you are using the filler), distinguish the difference between caulk and sealants.

The main difference between Caulking and Sealant is Elasticity.


Caulks when dried form a more rigid substance and are mainly used for areas that expansion and contraction are minimum. On the other hand, sealants are made of more elastic materials which makes them flexible after drying. Therefore, for filling the areas which are exposed to higher expansion and contraction, the best is to use sealants.

Although caulks are designed to be waterproof, but when used for outdoor spaces and subject to wide changes of temperature they dry out gradually and more vulnerable to cracking. Covering the caulks after drying with an elastic acrylic paint could increase the life of product.

If you are doing the caulking yourself, remember to clean up the stains before it gets dry!


As said before, sealants are elastic fillers (even after drying) and when applied correctly chance of appearing cracks or peeling off the surface is very rare. Because of flexibility of sealants, they keep a watertight seal even exposed to wide changes of temperature.

While sealants are not paintable and usually limited to black, white and grey, using the acrylic paint could turn them to any colour.


Application of sealants needs more time and attention. Spills and smears are more likely to happen and must be cleaned up with a solvent before drying or should be scraped off after curing time.


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