It ’s important to applyprimerbefore picture because it protects the surface and enables the paint to stand by better . As a result of its chemical paper , the primer forms a binding layer , protects the material from clay sculpture and seals pores on the airfoil . what is more , primer eliminates stains and makes the rouge chore last longer . In plus , tinted undercoat can reduce the number of coats of blusher you demand to reach a finished look .
Whether you ’re priming a poriferous core such as wood or a smooth substance such as metal , you call for to sandpaper the gist beforehand . Sanding a open removes the top glossy layer , allowing the centre to receive the ground . Without sand the aerofoil in advance , the new pelage of paint wo n’t stick to the previous bed . In addition to divest the outer layer of colour , you’re able to also usesandpaperto correct imperfection and take away grease . Sanding ensures that the surface remains barren of junk and that the finish is smooth and professional .
You ask to opt the emery paper grit size of it according to the material you ’re set up to prime . When sanding wood , for example , start out with common sandpaper , such as 80 - grit , gradually increase in fineness . Each prison term you advance to a higher grit size , you reject the cacography Mark from previous sanding . When sanding a softer control surface , such as charge card , you may need to protrude with a higher guts size of it , such as 120 , to avoid overweening scratch . For car repair and other metals , start with 60 - grit newspaper if you need to sandpaper down below the rust to fix recondite scar . Then increase the grit to 120 to remove rusting soil or shape body makeweight . Finally , just before you are quick to apply primer to the metal , smooth the automobile ’s open with a 320 - grit slice of fine sandpaper .
