No experience of the retailer, but can certainly vouch for two of the product lines.
I have used ACF50 for many years, albeit in aerosol form, and can confirm that it protects well. Alloy motorcycle forks are notorious for pitting when exposed to winter salty roads. I rode my Triumph Thunderbird 900 through seven winters with no discolouration of the polished alloy when sprayed every couple of weeks with ACF50. I now use it to inject into the back of the seams on my T3 as it penetrates well. Not had it long enough to prove or disprove the effectiveness yet (two years so far).
Likewise, Corrosion Block grease, to my mind, is superior to coppaslip as it does not dry and go hard. I have not had any difficulty undoing any fastener that I have previously treated with Corrosion Block.
The idea of ACF50 with a syringe to apply to the seams appeals to me so that retailer can have an order. Not seen similar packing of the product previously.

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South African 1991 2.5i Microbus - now sadly rehomed to pay for a Melco EMT16X Embroidery Machine.