How to fix ceiling patch shade?

Hi there,

I repaired the ceiling crack using Selley's gap filler, applied joint tape, and covered the area with multipurpose compound after sanding it with a sanding block. I used primer and then applied white color.

However, some patched areas on the ceiling now appear to have a different shade. What should I do to fix this?

Please help me.

Thank you, Mac.

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MitchellMc

Hi @Mac4,

Unfortunately, the image quality isn’t quite clear enough to pinpoint the exact cause, but there are a couple of common reasons why patched ceiling areas can appear a different shade.

The first is that the filler might be slightly raised or not feathered out far enough, so light is catching the edge where the filler meets the surrounding surface. This can create visible patches even if the colour is technically the same. In this case, you may need to sand the area back more, or if the tape is too thick to allow that, feather the edges of the compound further out into the ceiling so there’s a more gradual transition.

The second possibility is a difference in surface porosity. If only one coat of primer was used, the filler can absorb paint differently compared to the surrounding paper-faced plasterboard. This can leave the patched areas looking dull or slightly off-colour. Applying one or two more coats of primer over the patched area and then repainting should help even things out.

Please let me know if you have any questions.

Mitchell

Mac4

Thank you for your reply, @MitchellMc

I will try applying one or two more coats of primer and then paint the ceiling. Hopefully that will do the trick.

Pez-disp

@Mac4 i recently used this primer to paint over timber cladding and its specifically used for blocking out stains/ dicolouration underneath the primer. Might do the trick to block out any discolouration.

MitchellMc

Welcome to the Bunnings Workshop community @Mac4. It's brilliant to have you join us, and many thanks for jumping into the discussion.

Zinsser 1L White Bulls Eye Primer Undercoat Sealer And Stain Blocker is an amazing primer that effectively blocks stains. It's a fantastic suggestion, and I trust @Mac4 appreciates your input.

We look forward to hearing all about your projects and plans around the house and garden. Feel free to reach out anytime you need assistance or have something to share with the community.

Mitchell

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