From Route 78 Westbound: 

Take exit 40 (Watchung), make left onto Hillcrest Ave, make right onto Valley Rd, keep left and follow traffic circle, make 2^nd right off circle onto Somerset Ave. Proceed to Route 22, make a right onto Rt 22 West and take the West End Exit. Turn left on West End ave and to South 2nd Street. Turn right on South Street. Papp Iron Works is about a mile down the road.

 

From Route 78 Eastbound: 

Same as above except make right to Hillcrest Ave.

 

From Route 22: 

To West End Ave and follow directions from above.

 

From  Route 287:  

From Route 287, take exit 5 to Route 529 North (Washington Ave). Take Washington Ave. all the way to Route 28 (East). Turn right onto Route 28 (North Ave). Proceed to Rock Ave. Turn right onto Rock Ave. and pass under the overpass. Turn left onto South 2nd street, proceed past Clinton Ave. Papp Iron Works is a short distance on your left.

 

From Garden State Parkway and NJ Turnpike: 

If coming from points North of Newark Airport, go to Route 78 and follow directions above. If coming from points South of Raritan River, go to Route 287 and follow directions above. If originating in between, go to whichever is closer, Route 78 or Route 287 or consult local maps for secondary roads.

Note: Route 78 is quicker than Route 22.