No idea how good it is but I nearly bought a proper one a few years back for best part of £300, now under £30 on eBay...
https://www.ebay.co.uk/itm/Mortar-Cement-Spray-Gun-W-Hopper-Bucket-Wall-Sprayer-Stucco-Plaster-Sprayer-UK-/254565040067
I noticed recently that paddle mixers and various other similar useful tools have started to appear at the same price point -- typical just as I am no longer in the market for such things!
https://www.ebay.co.uk/itm/Mortar-Cement-Spray-Gun-W-Hopper-Bucket-Wall-Sprayer-Stucco-Plaster-Sprayer-UK-/254565040067
I noticed recently that paddle mixers and various other similar useful tools have started to appear at the same price point -- typical just as I am no longer in the market for such things!