Mate it's not you...the stuff is utter shite for workability. Chuck it in the skip and get a lime putty finish or one from Fassa. I never touch the stuff after a couple of bad experiences using it internally and externally because the customer had been brainwashed by their marketing.
As @paulf said remove that strip of plasterboard on the reveal as you can see if you eye up the line of the reveal it sticks right out proud of the plaster...then PVA and bond instead of using plasterboard. Should have left the head plasterboard overhanging the wall, filled flush and then cut back.
Love my 600mm s*p*r*lex...I'd also sponge on site but find it weakens the plaster so on domestic work my process is MT/s*p*r*lex/MT/FLEX/MT/PLASI/FLEX (over 2 coats)
Speed skims are sh*t they bring the moisture to the surface and get loads of air bubbles...might be alright on site on board and...
Just bought a dust scrubber was 1K but great in peoples houses when mixing up...don't have to wear my mask all day house air is clean after mixing with in 5 mins. Festool insulation saw and cordless mixer next on the list.
Found in the shed lol...you could screw the cement board or a piece of plasterboard to the lintel. If you use cement board...blue grit it before bonding. If you use plasterboard go straight over with the bonding.
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