How to intervene for grouting, smoothing and painting a plasterboard surface?

PROBLEM: How to fill, shave, and paint a plasterboard surface.

If it is necessary to intervene in the filling and subsequent smooth plastering of all surfaces, including the final painting.

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CYCLE		INDICATIVE QUANTITY OF MATERIAL PER SQM
1	Make multiple fillings with KARTOFÜLLER powder putty for smooth finishes, embedding specific gauze or paper tape.	0.9 KG/SQM PER MM THICKNESS
2	After seasoning, sand the fillings to eliminate wrinkles and disconnections. Carefully clean the surfaces to completely remove any dust residue.
3	Apply the shaving in multiple layers, ensuring to sand between each layer with KARTOFÜLLER powder putty for smooth finishes.	0.9 KG/SQM PER MM THICKNESS
4	If the fillings are crumbly or excessively absorbent, it is recommended to apply a coat of FIXACRIL, water-based fixative with strong penetration, appropriately diluted.	10 - 15 SQM/L PER COAT (UNDILUTED)
5a	OXI FREE - VOC≃0 - WASHABILITY 4 - COVERAGE 2 Apply two or more coats of breathable supercovering interior paint free from formaldehyde.	7 - 9 SQM/L
5b	FLORAL 402 - WASHABILITY 1 - COVERAGE 2 Apply two or more coats of superwashable paint for exteriors and interiors. It can be sporadically washed with a non-abrasive sponge.	9 - 11 SQM/L PER COAT