In my opinion, this mortar will not work. use concrete.
Yes, it will bond nicely.
The Mfg suggests dry colorants. '....Answer: Yes. The color of MORTAR MIX can be modified by using dry powder pigments designed for use in cementitious building materials. ...'
According to the specification sheet, "Do not install on frozen surfaces. MORTAR MIX may be applied in temperatures ranging from 45°F to 90°F (7°C to 32°C)." The cure time is one hour. I believe they are saying the temperature must remain above 45 degrees for @ least one hour.
My tables have been outside for the last two years and no cracks or flaking.....
I'd suggest you use other products for plaster work. The Mortax Mix has rough sand in it.. You'll find the finish more suitable for stucco work. They do sell a product that's a better choice for plaster. Try a small sample first. '....Rapid Set OnePass is used for general construction and repair of wallboard, cement board, magnesium oxide board, plaster, smooth stucco, masonry, some wood repair applications and many other surfaces. 1 Pass is formulated with premium-grade hydraulic cement, high-performance polymers and quality, finely ground aggregate. It is a fast-setting, weather-resistant and mold-resistant construction material that works well in wet areas. Apply 1 Pass on many types of interior and exterior surfaces, from featheredge to 1 in. D in a single, full-depth application....'
After 16 hours.
I'd suggest NOT. From the manufacturer;'....Use Mortar Mix for general and structural concrete repair, stucco and plaster repair, one-coat exterior plaster, mortar beds, underlayment, and formed work...'
Charlie, I think you could use this product for filling your cracks. Just be aware that this product is very fast setting. If you have a lot of work to do, you might think about using a regular type M mortar.
I've done so but for a better artistic product they recommend the product CEMENT ALL.. It's finer physical texture fills voids and molds better. HINT - Use the SET product additive to allow you more time to work with the mix. Look at the various online videos about these products in YouTube to see the differences.