Not your ordinary rubber band. This hardened steel ball is used to create bull’s-eyes in laminated practice glass. Don’t be fooled by soft steel Bull’s-Eye Maker imitations that flatten with every blow. This simple Bull’s-Eye Maker tool will last indefinitely when used according to instructions.

From the Archives

Ring Around the Bull’s-eye

Pressure Ring or Trapped Air?

A recent post on windscreen-repair-forum.com brought to my attention that even some experienced windscreen repair technicians are confused about the cause of the ring around the outside of a bullseye, which is sometimes visible after the completion of a windscreen repair. It’s time to separate the facts from the fallacy.

To be fair, there are several possible causes for a ring around a bullseye, and understanding the cause is the key to identifying what you are seeing. In this three part series, we will explore the primary causes.

A pressure ring is translucent; it has no color, and has a bit of a watery look to it.  What you see is the injection resin between the glass and the Polyvinyl Butyral (PVB). Causes include:

Excessive pressure.

Forcing resin into the damage under excessive pressure, it can separate the PVB laminating material from the glass.

  • “Flowering” or “the daisy effect” is this form of separation or delamination of the glass. If the damage is severe enough the injection resin may end up between the PVB and the glass resembles the shape of a flower. On a bull’s-eye it is typically a symmetrical ring “pressure ring,” around the outside of the damage. On a crack or star break it will generally follow the shape of the damage with just a fine watery looking line.
  • It does not take a great deal of pressure to inject resin into most damage, and very little pressure to fill a bullseye. Do not use more pressure than necessary and avoid the use of injectors advertised as “high pressure.”
Excessive heat.
  • Heat causes the PVB to soften, allowing the injection resin under pressure to separate the glass from the PVB.
  • Adjust glass and resin temperatures to the Delta Kits recommended range of 70° – 90° Fahrenheit before starting a repair whenever possible. If the glass is warmer than the recommended temperature range, start with less pressure than normal.
Old glass.
  • Over time the glass layers will begin to separate from the PVB layer between them. Most often beginning with the edges of the glass where the PVB is open to the air. Also, while this is very common in vehicles that are over 10 years old, the delamination process may actually start much sooner… Continue Reading

2 reviews for Bull’s-Eye Maker

  1. Rated 5 out of 5
    ( 2 reviews )

    Alexei B.

    We need this product for training. Very important thing! With it, we train better.

  2. Rated 5 out of 5
    ( 2 reviews )

    Leonard H.

    Makes the best bulls-eye and half moon breaks.

Only logged in customers who have purchased this product may leave a review.

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Training and Tradeshows

This windshield repair training is a hands-on, intensive, one day course designed to take your repair quality to the next level. Whether you are just starting out or are a seasoned pro, this class is right for you!

Our team of experienced technicians are dedicated to offering the highest standard of training in the windshield repair industry. During the Delta Kits Training and Certification course, technicians are trained to follow ROLAGS (Repair of Laminated Auto Glass Standards), the industries best practices. Delta Kits Training and Certification covers all technical aspects of windshield repair and will take you from never having completed a repair, to being among the best technicians in the industry. The marketing and insurance billing discussion is designed to help you become more successful in your windshield repair business.


Who are our experts:

Heinrich Hermanus from Jerxheim in Germany has been working with Delta Kits since 2003. As a certified Delta Kits trainer, he has taught numerous people how to perform perfect rock chip repairs in the years since 2006. As a Delta Kits distributor in Europe, he speaks German and English and provides valuable services to many customers and users with his clearly formulated tips and instructions, whether by phone, mail correspondence or on-site at the customer.

Graham Watson, is one of the original Novus Technicians in the UK since 1988 and since then has been running a very successful windscreen repair service in the UK. In 2008 Graham was named Windshield Repair Person of the year at the Mobile Tech Expo, an award he is very proud of as it is voted for by his peers in the trade. For the past 10 years, Watson has been active training technicians for the repair industry and specializes in advanced training for techs with previous experience, during this time he has been lucky enough to work with people from many different countries. His passion for helping others carry out the best quality repairs possible shows in the time he spends offering advice on different trade forums as Screenman.