Fiberglass Body Filler Thickness Limits Explained Fiberglass body filler is used to cover imperfections and get a traditionally perfect surface, often as part of automotive repairs. The thickness of an application is usually 1/8 to 1/4 inch. This is an important guideline to follow for superior adhesion and long-life in repairs.
Application fluffy brackets
1/8 Inch — this is usually the optimal maximum thickness for most tasks. This is because it smoothes well over minor faults without cracking or shrinking when the product cures (45).
1/4 Inch: Though some manufacturers allow you to go up 1/4 inch, thicker applications should only be made if there is proper prep work done on the existing surface6. This is another important because surpassing this boundary may cause trouble such as sagging over time, or poor bund between the Substrate and Paint3.
Considerations for Thickness Displays
Surface Prep: Good surface prep must be done before any body filler is applied. This means polishing, sanding and ensue that there is no rust or junk34.
Fillers Type: Each filler have different properties. Longer open times and quicker fill-using fiberglass-reinforced fillers: Fiberglass-reinforced can be used for a slightly thicker application because it is stronger, has increased bond strength26.
Repair Location: Where you are making the repair also changes how much filler can be applied. For horizontal surfaces, leaving a bit thicker layer is okay if properly supported (23), but on vertical surfaces you would want to go thin so it won’t sag.
In summary, the consensus is for fiberglass body filler to be laid in 1/8 inch -to- 14 inch layers overall but should take into account specific repair conditions and material types.fiberglass body filler (ad)
