Yes, it should be. The required undercoat/primer is available in Home Depot,less than $20 last time I used it.
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It can be used on concrete or many of the modern fake concrete boards like Hardibacker.
If you were to give your house one coat of smooth masonry paint you would need 25litres of masonry paint, this may be different dependant on manufacturer or paint but this applies to Leyland Trugard Smooth Masonry which I stock in my shop. 10sq m per 1LTR - Trugard Smooth 25LTRS in standard white or magnolia is £81.00 Two Coats would obviously be £162.00 If a coloured masonry paint is required the price increases due to tinting costs. £25LTRS of colour is £103 Two Coats would obviously be £206 KEEP IN MIND THAT THIS IS NOT A REGIONAL PRICE THIS IS JUST OUR COSTS DURING OUR SUMMER MASONRY DEAL!!! Richard...Professional Paint Direct
If it's latex based, you can try a product called goof-off.
Very unlikely, although possible if it's a very matt wallpaper. You could try using a matt undercoat, then gloss on top.
only if you want it dark red Black as an undercoat is not the best way to get a good saturated colour, your paint retailer can provide you with a good quality red undercoat/primer, this is a MUCH better base for a red wall.