Critical Light

Tips For Tradies

This month’s tip regards a simple way to reduce the possibility of being caught out by critical light and an over enthusiastic painter.

In the two photos below, you can quite easily see the shadows, humps and hollows revealed by the direct sunlight streaming along the wall. You can also see what looks to be an unsanded edge of the plaster on the vertical external corner.

Many of you will have had the familiar accusation of not feathering the edges when sanding. This appearance of an unsanded plaster edge can crop up in a few scenarios. The most common is that the plasterboard paper fibres have been fluffed up as a result of sanding and have remained raised when acrylic paint has been applied. The second common scenario is that the painter has been too enthusiastic with rolling acrylic sealer on the plaster and has “reactivated“ it, causing it to absorb the moisture from the paint and swell slightly. The painter in both cases needs to be made aware that he should sand his sealer first, then if there is still a problem call the plasterer back to look at it.

Regarding the direct sunlight….. When plastering a room, if you see a wall that is by a window where direct sunlight will shine at a critical angle, it can help to buy a sheet of black plastic / polythene and to block out all natural light in the room when sanding that room. Set up a high powered lamp to shine as close to the wall as possible to simulate what you would see when the sun shines along it. This has proven to be a good method for eliminating costly callbacks.

Tips for Tradies image 1

Tips for tradies image 2

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