Stone - Chips

Definition

Mechanical damage to the paint surface and film build due to flying stones (e.g. chippings, stones and debris).

Causes

Stones of various weight, shape and size are flung onto the paintwork at varying levels of energy

(velocity and size).  Depending on the impact force, the top-coats and also the primer/surfacer coats can be damaged down to the substrate (metal, plastic or electrocoat).  Moisture may then penetrate the paint film and further flaking can occur.

How to avoid

There is no total protection against stone chips. Areas most greatly at risk can be given treatment of additional anti-chip and underbody protection coatings for extra protection to avoid corrosion of the substrate. (e.g. Glasurit Stone Chip Primer 1109-1240/6 and/or the use of Glasurit Soft Face Additive 521-111 in the top-coats or clear lacquer to increase to increase the flexibility). (4 parts by vol paint or clear to 1 part  521-111 before adding the hardener and thinner).

Repair

Stone chips should be touched-up  immediately.   Sand out and build up with the correct primer and/or top-coats.