Problem Solving and FAQ
Problem Solving
Adhesive Pulling Away From Glass
Q. WAS A PRIMED OR PRIMERLESS-TO-GLASS ADHESIVE USED?
A. Primed adhesive was used without glass primer.
Q. WHICH PRIMER WAS USED ON GLASS?
- Body primer was used on glass (will effect primed or primerless adhesive).
- Applied too thin or past open or shelf life.
Q. WHO MANUFACTURED THE GLASS AND WHICH FRIT (IF ANY) WAS USED?
- Thin layer of frit may be peeling (delaminating) from the glass taking the adhesive or adhesive primer with it.
- Lack of frit and any additional black glass primer may be passing an excessive amount of UV light, degrading the adhesive.
Q. HOW WAS THE GLASS CLEANED AND WHAT PRODUCTS WERE USED?
- Ineffective cleaning could leave contaminate present leading to release.
- Use of chemicals or solvents could prevent proper bonding.
- Primer or adhesive applied over wet surface could prevent proper bonding.
Corrosion on Flange or Pinchweld
Q. IS THIS THE ORIGINAL INSTALLATION OR HAS IT BEEN REPLACED BEFORE?
- Previous installation left the paint damaged and it was not sealed during the installation with paint or adhesive primer.
- Flaws in original paint on the pinchweld or flange.
Adhesive Pulling Away From Flange or Pinchweld
Q. WHICH BODY PRIMER WAS USED ON THE PINCHWELD OR FLANGE?
A. Incorrect body primer was used on the pinchweld or flange.
Q. WAS ADHESIVE BODY PRIMER APPLIED TO PAINTED AREAS OF THE PINCHWELD BEFORE APPLYING NEW ADHESIVE?
A. No body primer was used on the pinchweld or flange.
Q. WAS APERTURE CLEANED BEFORE APPLYING BODY PRIMER?
A. Dirt prevented body primer from bonding to the pinchweld or flange.
Air Noise and Water Leaks
Q. DID THE ADHESIVE MAKE PROPER CONTACT WITH ENTIRE PERIMETER OF GLASS AND BODY?
- Application of new adhesive may be the wrong shaped bead (round?).
- Bead height may be insufficient to make proper contact with glass or body.
Q. WERE THERE ANY GAPS IN THE BODY OR MOLDING ALLOWING LEAKAGE AROUND THE ADHESIVE?
A. Body seams or bead of new adhesive may cross molding to allow air or water leakage.
Q. WERE ALL JOINTS IN THE ADHESIVE SEAMED (TOOLED) COMPLETELY?
- Over-tooling of new adhesive may have created small gaps in attempt to close large one.
- Joint may need additional adhesive to fill joint.
- More attention may need to be paid to tooling joints.
Molding Releasing From Glass
Q. WHAT TYPE/BRAND OF MOLDING WAS USED? WAS THIS A "UNIVERSAL" TYPE MOLDING FROM A BULK ROLL?
- Adhesive may have "skinned" over before molding was inserted.
- Molding may have been stretched while applying to glass and shrinkage is pulling it loose at corners.
- Adhesive may be too thick to flow into edges and fins to cure and create mechanical bond.
Q. ARE ALL CLIPS AND OTHER MECHANICAL FASTENERS IN PLACE? IS THE GLASS TOO SMALL OR LARGE?
- Glass may have too large a gap at top of glass and is allowing molding to come loose at top center.
- Key fasteners at center or corners may be missing or broken putting uneven stress on the molding.
FAQs
Glass Preparation
Q. WHAT HAPPENS WHEN A PRIMERLESS-TO-GLASS ADHESIVE IS USED WITH GLASS PRIMER?
A. As long as it is the correct primer for the bonding surface and the adhesive, there will be no problem. Improper application of the primer could lead to a poor bond regardless of it being primed-to-glass and primerless-to-glass products.
Q. CAN A CLEAN PAPER TOWEL OR RAG BE USED TO APPLY PRIMERS TO THE BODY OR GLASS?
A. Always use a clean unused wool dauber/felt to apply primers. Absorbent materials such as paper towels and rags do well to absorb primer but apply it to surfaces poorly.
Q. DOES THE GLASS AND BODY PRIMER NEED TO BE SHAKEN FOR EACH JOB?
A. Advanced formulation BETAPRIME™ 5504G All-in-One Primer no longer requires shaking. However, shaking won’t have a negative effect on the performance. (NOTE: BETAPRIME™ CLEAR ADVANCED does not need to be shaken before use.)
Body Preparation
Q. CAN A CLEAN PAPER TOWEL OR RAG BE USED TO APPLY PRIMERS TO THE BODY OR GLASS?
A. Always use a clean unused wool dauber/felt to apply primers. Absorbent materials such as paper towels and rags absorb primer well but apply it to surfaces poorly.
Q. DOES THE GLASS AND BODY PRIMER NEED TO BE SHAKEN FOR EACH JOB?
A. Advanced formulation BETAPRIME™ 5504G All-in-One Primer no longer requires shaking. However, shaking won’t have a negative effect on the performance.
Adhesives
Q. WHY IS IT RECOMMENDED TO USE A V- OR TRIANGLE-SHAPED BEAD WHEN DISPENSING ADHESIVE?
A. A V- or triangle-shaped bead provides maximum “wet-out” of the adhesive. It pushes air out and minimizes leaks. A V- or triangle-shaped bead also uses less adhesive versus a round bead with the same contact area. The V- or triangle-shaped bead should be at least 2/3 as wide as the bead is tall to avoid the bead rolling over.
Q. WHAT HAPPENS IF A BEAD OF ADHESIVE ON THE GLASS OR BODY IS LEFT LONGER THAN THE RECOMMENDED WORKING TIME?
A. Polyurethane adhesives start to skin once exposed to the elements. After the stated working time (on technical data sheet), the skin will impede proper wet-out and link-up to the bonding surface.
Q. HOW CAN THE CURED ADHESIVE BE REMOVED?
A. Cured BETASEAL™ adhesives need primer to bond to painted surfaces or plastics. If the cured adhesive is on unprimed (non-glass) surfaces and has not linked up, they might be able to be rubbed off. It is best to clean the uncured adhesive from unintended surfaces with solvent before it cures.
Q. WHAT IS THE BEST WAY TO STORE BETASEAL™ ADHESIVES?
A. BETASEAL™ adhesive packages should be stored so as to keep the packaging dry and damage free. Material should be stacked only to a nominal height to avoid crushing the packages on the bottom.
Q. AT WHAT TEMPERATURES SHOULD BETASEAL™ ADHESIVES BE STORED?
A. BETASEAL™ adhesives should be stored for extended periods at an ambient temperature that does not continuously exceed 110°F (43.3°C) to maintain the stated shelf life marked on the packaging.
Q. WHAT IS THE AGSC WEBSITE?
A. www.agsc.org.