https://www.morrells.co.uk/
A/C is acid catalyst. Basically its a two pack lacquer. Mixed 9 to 1.
You need a good vapour filtering mask to spray this stuff.
Three coats and yes I sanded between the coats with 320 grit giving over 12 hours to cure between each coat.
Though they say sandable in 45 minutes at 18 degrees Celcious.
I purchased the product from a specialist morrels supplier.
They didn't recommend a sealer coat but I'm pretty sure morrels do one.
The first coat does seem to get absorbed into the wood and rises the grain. The finishing section of the forum is a good place to start for advice on finishing.
I've used sanding sealer as a base coat and finished with water based acrylic varnish with a brush to good effect also.