Haven't seen it used here, but there's this informed review of the product from Amazon:
"Rustins Plastic Coating was used by Brian May of rock group Queen to finish his famous guitar, The Red Special, in 1963. Hence it is favoured by those who seek to build replicas of his guitar.
In general, RPC is simple to use but there are a few key limitations that need to be understood to avoid the finish wrinkling or rippling.
A previous version of the instruction leaflet stated "A minimum of three coats is recommended but many more can be applied. Marquetry is often given as many as nine coats." It is not known exactly how many coats Brian May applied to his guitar, but since the Red Special was finished with knife cut mahogany marquetry veneer approximately 0.6 mm thick, it is likely that he followed this advice and applied many coats.
The most key piece of information is that you have to either get three coats on within two hours (to achieve the window for a chemical bond) or wait several days for the previous coating(s) to fully harden before the window for a mechanical bond will be achieved.
This is because the surface hardens relatively quickly but under layer remains soft and can be reactivated by the next coat leading to a wrinkled or pitted finish.
The recommended time that should be left for the coat to harden completely varies from 3 to 6 days because this is dependent on ambient temperature. The warmer the temperature, the sooner the coat will harden. The instruction leaflet recommends temperatures above 18 degrees Celsius.
Initial rubbing down should be done using 600 to 1000 grit wet and dry and/or 0000 grade wire wool to apply a key for the next coat. Only progress to a finer grit when you are ready to apply the final coat.
Try to avoid using RPC on a product that has been assembled using PVA or water based glue, as the coating can sometimes react with the PVA glue and cause problems later on. The best glue to use is Cascamite or other resin based glue.
RPC is extremely sensitive to contaminants such as cleaning chemicals, wax polishes, food stuffs, oils etc. If these for any reason enter the timber the strong solvents in the PC will dissolve them out and will probably not affect the first coat but the second."
So a three-day finish is possible, but unlikely. You do need to leave it to harden properly otherwise you'll leave fingermarks etc. And the curing time is temperature dependent, so a warm day and it will be quick. a mild or cold day and a lot slower. And it has a very strong resin smell, so best not done in the house.
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