sir mas mabilis mag liha kung gagamit nang orbital sander or oscillating multitool na may dust extraction port tapos kabit sa vacuum para wala nang dust
magtatagal lang naman kapag may tuklap na existing paint at butas na kailangan pa masilya, mas hahaba yung paint preparation kasi after liha then masilya , after matuyo masilya, liha ulit, then first coat, after matuyo yung masilya naninilaw, kung white paint mo kailangan pa second coat