18-11-2018, 06:51 PM
It may also be worth saying that while crack test kits are good for drawing your attention to areas of interest, they sometimes highlight tool marks etc. which are not cracks, so the test must be followed up by careful inspection with a magnifying glass. If you don't have a crack test kit it is perfectly possible to find surface cracks - the larger ones at least - by optical means. None of these methods is infallible so they are best used in concert with each other.