How to File Nail Extensions Into Shape

Which file grit to use when

• 100–150 grit: Bulk removal and shaping — getting the shape and removing excess product; use for hard gel and acrylic; too coarse for gel polish or the final surface
• 180 grit: Refining the shape and removing 150-grit scratches; the main shaping file for most enhancement systems
• 220–240 grit: Final surface smoothing; removing 180-grit marks before buffing
• Buffer block: Creates the smooth shine on gel surfaces; not needed if you're applying gel colour on top

Filing to length

• File all nails to the approximate target length before beginning to shape — set the length first so you're shaping from a consistent starting point
• Hold the file flat to the underside of the free edge for an even cut; angling the file shapes rather than cuts to length
• Check both hands from the same viewing angle — holding them side by side to check length match
• If using clippers first: clip conservatively (too long) and file to the final length — it's easier to take more off than to add back

Filing the shape

• Angle the file to the side walls: Hold the file at 45 degrees to the sidewall to create the taper for almond, coffin, and stiletto shapes
• Work in one direction: Filing back and forth creates heat and can weaken the product edge; use consistent forward strokes
• Use the same strokes on both hands: The same angle, the same number of strokes per side — consistency produces symmetry
• Step back frequently: Hold the hand at arm's length and check the shape from a distance — problems are more visible from further away

Specific shape guides: almond · square · coffin.

Filing the surface

• After shape is finalised, move to surface smoothing with 180 grit — remove any lumps, ridges, or uneven areas in the product surface
• Work in long, sweeping strokes across the full nail length to smooth unevenness
• Focus on the apex — this is where product tends to pile up during application; smooth it to the correct height
• Finish with 220 grit to remove 180-grit scratches before buffing or applying gel colour

Achieving symmetry

• Mirror each nail: After shaping each nail, immediately check the same nail on the other hand
• Check from multiple angles: Top view, side view, and looking straight along the finger — shape problems are visible from different angles
• Use a light source at nail level: Holding the hand at eye level with a light source behind the nails reveals asymmetry in the C-curve and surface that you won't see from above
• Take your time on the pinky: The smallest nail is the easiest to file asymmetrically — slow down and check frequently