Crack repair - Weathercrete and Joint Sealer

I have, in separate posts, dealt with the repair of cracks using both Weathercrete and Joint Sealer.
Weathercrete is a "twin-pack" material comprising of a pre-weighed, dry cement component, mixed immediately prior to use with a liquid polymer. The resulting repair plaster has very good adhesion to a variety of substrates, is water-proof, highly abrasion resistant, and has a good degree of flexibility. Thorough mixing on site prior to use is a problem in some cases, as mechanical stirring is advised. More and more of our regular contractors are opting to use Joint Sealer - a high volume solids acrylic, rather than Weathercrete, to fill cracks on walls. Weathercrete remains the product of choice for repairs on floors, however, where abrasion resistance needs to match that of the surrounding substrate.
On walls, both repair materials should be over-coated with two coats Elastocryl prior to the application of top-coats, so that the necessary film thickness is achieved to permanently seal the crack.