Royston Handy Cap, Requires Primer

Corrosion Protection for Exothermic Grounding Connections. Designed to be Used with Royston Roybond 747 Primer.


The Tapecoat / Royston Handy Cap™ is a 4" x 4" prefabricated assembly designed for cathodic protection of leads to pipes and tanks. When pressed by hand into position over the anode lead wire weld, it forms a thick, highly resistant electrical insulation seal over the weld, the end of the lead wire and the surrounding area of the pipe or tank.

The Handy Cap requires use of the Royston Roybond 747 Primer. Also see two Royston prefabricated assemblies with an integrated primer: the 4" x 4" Handy Cap IP™ and the 5" x 5" Handy Cap XL IP™


1.A top plastic sheet formed with an igloo shaped dome and entry tunnel for the lead wire.

2.A special elastomeric compound in the plastic dome, which is firm enough to resist flow at all normally encountered application and operation temperatures, but soft enough to mold itself around and completely cover the irregular welded profile.

3.On either side of the dome are a double row of parallel, flexibilizing serrations to assist with conforming around small diameter pipe.

4.A base of Royston Tac-Tape, a black unbacked elastomeric tape with exceptional adhesive properties, for bonding firmly to the metal surface, when used with Royston Roybond 747 primer.


Royston Handy Cap™ is easily applied and economical. It may be used on all anode lead wire and test wire weld areas. It is especially useful for welds on mill coated pipe where only a small part of the coating has been removed to permit installation of the thermite grounding connections. It is ideal for use in limited access situations, because it can be manipulated easily and applied at arm's length.



Typical Properties

Molded plastic cap filled with corrosion resistant compound on a base of thick elastomeric tape. Construction
 4" x 4"  Overall: Dimensions
 2.75" x 4" (serrated)  Plastic sheet:
 10 mils  Sheet thickness:
 1.625" dia, 0.8" height  Plastic dome:
 165 mils  Adhesive thickness:
  2.1 oz  Weight
  -20 to +120°F  Application temperature
  -40 to + 185°F  Service temperature
Rotate annually     Shelf life


Royston Handy Cap IP, Integrated Primer

Primerless exothermic weld patch.


 Handy Cap IP is a 4" x 4" prefabricated assembly designed to provide quick, field-applied corrosion protection to anode and test lead wire welds on metal pipe and tanks. This economical product is ideal for use in limited access applications. The design of Handy Cap IP makes use of innovative Tapecoat Gray Adhesive technology with an integrated primer. The integration of a primer in Tapecoat Gray makes field application of Handy Cap IP easier and more economical.

  • No separate liquid primer required.
  • Ideal for keyhole applications.
  • Dome and tunnel provide easy access.
  • Elastomeric compound encases weld profile.
  • Serrations conform to small diameters.

 Easy Field-Applied Corrosion Protection

Tapecoat Gray Adhesive bonds the tough outer shell of the Handy Cap IP to the bare metal weld area and surrounding plant applied coating. Innovative Tapecoat Gray incorporates an integrated primer in its adhesive and provides exceptional bonding without the costly application of liquid primer. A protective compound within the dome molds itself over the irregular welded profile and encases the exothermic connection.

 Application Information

 1.Clean all mud, dirt, grease, oil and other contaminants from the metal surface and mill coating which is to be covered. The Handy Cap IP incorporates an integrated primer in its Tapecoat Gray Adhesive and does not require the use of a liquid primer prior to application.

2.Remove the release paper from the bottom of the Handy Cap IP. Bend the plastic sheet inward at the serrations when applying to small diameter pipe. Position and place the Handy Cap IP on the welded area with the tunnel over the lead wire.

3.Push the dome of the cap firmly into the weld area. Lift the lead wire away from the pipe and squeeze the adhesive compound completely around and underneath the wire. Push the lead wire back down on the pipe and press the elastomeric compound into firm contact with the pipe over the entire area.

No further protection is required when the Handy Cap IP covers the entire exposed metal area. Uncovered areas should be protected with primerless Tapecoat or Royston tapes. Remove the narrow plastic release film to accommodate tool use for keyhole applications.