My second fill was 50mm then painted and could see the filler even when sanded down then in the end i thought just sand it back to hair line crack too only see the hairline cracks filled but the finish came like this soo confused at the moment i havent used any primer im using dulux matt paint...
Just tried filling hairline cracks in the hallway and sanded back put first and second coat but the lines where filled are still visible any advice will be much appreciated do i need to use a primer now over the second coat or do i sand back first lost in what to do and losing hope guys