A water-repellent windshield coating starts with clean, well-prepared glass. In this video, Bradley walks through cleaning, decontamination, and applying Armour Glass Coating, explaining how the condition of your windshield affects the preparation it needs.
Watch the full windshield coating walkthrough.
Assess the Glass Before Choosing the Prep
Bradley demonstrates this process on a nearly new truck. Its windshield has no obvious water spots or previous water-repellent coating, so it does not need every preparation step that an older windshield might require. That is why the condition assessment comes before opening the coating bottle.
Look for road film, bonded contamination, old repellent residue, mineral deposits, and physical damage. Cleaning and decontamination can remove attached material. They do not repair chips, cracks, deep scratches, or etched defects. Deal with damaged glass separately and confirm any treatment is suitable for your vehicle's glass.
Work on cool exterior glass out of direct sunlight, follow the coating's safety directions, and gather clean towels before starting. A coating can help water behavior and maintenance, but it does not replace functioning wipers or clear visibility.
Step 1: Clean Off Loose Dirt and Film
Bradley uses HERO Rinseless Wash at 128:1 for the preparation method shown. Apply enough solution to clean the exterior windshield and wipe away loosened grime with clean microfiber. Change towel faces as they load up rather than spreading dirt around the glass.
If the rest of the vehicle needs washing, do that first so dirty runoff does not land on your prepared windshield. An isolated windshield job can still work, but the surrounding area should be clean enough that contamination does not immediately return.
Routine streak-free cleaning and coating preparation have different endpoints. A clean-looking surface with a protective detail spray on it is not necessarily ready for a new coating. The later residue-removal stage is part of preparing the glass properly.
Step 2: Remove Bonded Contamination Where Needed
Bradley uses the same HERO solution as lubrication with the Armour Clay Block. Keep the glass and tool well lubricated, work a manageable area, and use gentle pressure. Rinse the media frequently and stop if it drags or collects debris that will not release.
The aim is to remove attached surface contamination and leave the glass clean and smooth. Extra pressure or repeated dry passes do not improve the process. Traditional clay is another option when used correctly; our clay comparison guide explains the differences.
Remove the loosened residue before assessing the next step. Clay is not a substitute for evaluating water spots, old coating residue, or damage that may still remain.
Step 3: Decide Whether Polishing Is Necessary
The new windshield in this demonstration does not need polishing. On other vehicles, remaining water spots or old repellent material may call for an appropriate glass preparation process before the coating can be applied evenly.
Bradley discusses a suitable plain polish or compound without added protection, used with appropriate polishing media. The purpose here is further cleaning and removal of interfering residue. Do not assume an all-in-one polish that leaves wax or sealant is equivalent.
Glass polishing is not a promise to remove deep scratches or every etched deposit. Use compatible equipment and technique, and seek specialist guidance where the defect or glass design makes the process uncertain. After polishing, remove all residue before continuing.
Step 4: Finish with Panel Prep
Use Panel Prep as directed to remove oils and remaining preparation residue. Bradley performs two rounds, using clean towel material so each pass actually removes contamination.
Inspect the glass for a clear, uniform appearance. Check the lower edge, corners, and perimeter where residue can collect. Do not proceed over visible smearing or polish left around trim; another coating layer will not fix that preparation issue.
Step 5: Apply Armour Glass in Controlled Sections
- Prepare the product. Follow the current Armour Glass Coating directions and prime a fresh applicator with the specified three lines.
- Begin with half the windshield. This keeps the application and wipe-off manageable, especially in warmer conditions.
- Spread an even, visible film. Use overlapping circular motions and the directed pressure. Cover the edges and reload when the film becomes too thin to track.
- Level promptly. The current formula can be removed immediately or after a short dwell. You do not need to wait for a paint-coating-style flash.
- Finish with clean material. Use a separate finishing towel and inspect for streaks, cloudy spots, or remaining excess.
- Repeat on the other half. Overlap the center boundary carefully and inspect the whole windshield from several angles.
The video includes a longer dwell demonstration to illustrate the product's forgiveness in those conditions. That is not a reason to deliberately extend the dwell on every job. A controlled application and complete leveling are the useful goals.
Step 6: Complete the Second Windshield Layer
Two layers are recommended on the windshield. Repeat the same methodical coverage and leveling process, using smaller additions of product once the applicator is already primed. Keep track of both halves so the second layer is complete.
The current Armour Glass formula requires no cure interval between layers and permits driving and water exposure immediately after application and final leveling. For more on layering and ongoing care, see our Glass Coating layers and aftercare guide.
Final Visibility and Maintenance Check
Inspect the view from the driver's seat as well as outside. Remove all visible coating haze before driving and make sure the wipers remain in proper working condition. Use them whenever needed for visibility, regardless of the coating's water-repellent behavior.
Maintain the glass with suitable cleaning products and clean towels. Road film and bugs still need removal. Our streak-free windshield cleaning guide explains the wet cleaning and separate finishing passes.
Do I need to polish every windshield?
No. Bradley skips it on the nearly new glass shown. Base preparation on the actual contamination and old protection rather than adding an unnecessary polishing step.
Can I coat over visible water spots?
Assess and address the spots first. Coating over them can leave the appearance problem in place, and surface deposits are different from etched glass damage.