Stelmax bonds to materials by means of a specific system of chemical adhesion and not a stick or tack process similar to that provided by sticky tapes and `squidgy` stuff one might use to `sticky-tac` posters to a wall. Many sealants can be removed easily and will naturally come unstuck after a limited period.

When providing a reliable, permanent seal, it is of primary importance to ensure a strong chemical bond between surfaces, particularly if the joint is going to be subject to movement.

Windows and doors expand and contract very slightly with seasonal temperature fluctuations and it is important that when the small gaps and joints within the frame move to compensate for these stresses and strains that the integrity of the bond is not affected.