hair cracking

hairline cracking, hair cracking, plastic shrink-age cracks

Very fine cracks, in a random pattern, which usually do not completely penetrate a paint film, an exposed layer of concrete, etc.
McGraw-Hill Dictionary of Architecture and Construction. Copyright © 2003 by McGraw-Hill Companies, Inc.
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Apply Andrew Collinge Leave-In Conditioner, pounds 2.99 for 200ml, or Boots Sun & Swim Watersport Protection Gelee, pounds 2.99 for 150ml, before you go swimming to prevent hair cracking. It'll make your hair easier to comb through, too.