What safety precautions are important?
Documented on the Ford Mustang build
Published February 26, 2026
Wear eye and hearing protection, gloves, and a respirator when grinding or welding.
Full Answer
Wear eye and hearing protection, gloves, and a respirator when grinding or welding. Support the vehicle securely on jack stands, disconnect the battery before welding near wiring, and shield brake lines and components from heat.
Documented In This Build
Related Knowledge
How much wheel/tire clearance gain can I expect?Will cutting the fender wells affect structural integrity?Do I need a welder or can I use rivets?How do I prevent warping when welding thin sheet metal?What wheel/tire sizes can this modification accommodate?How much extra tire/wheel clearance can I expect?How difficult is this for someone with limited metalworking experience?How much wheel/tire clearance should I leave when shaping the fender well?
Related Parts
Body filler (small tub)
$15
MIG weld wire (flux core/alloy appropriate for mild steel)
$15
Grinding / flap discs (pack)
$10
Mild steel sheet (approx. 18ga)
$60
Aftermarket fender well liners / splash shield (trim-to-fit)
$80
Pop rivets (assortment)
$10
Automotive seam sealer (tube)
$12
Primer / rattle-can (epoxy or etch primer)
$20
Underbody coating / rustproof spray
$18
Related Tools
Jack and jack stands
Angle grinder
MIG welder
Hammer and dolly set
Drill and spot weld cutter
Cutoff wheel / abrasive wheel
Reciprocating saw / Sawzall
C-clamps / locking pliers
Marker / measuring tape / templates
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