Hello all. I am in the process of painting a large ceiling. It has been painted several times and from particular angles lap marks or some sort of patchiness is visible.
After much faffing and research, I think what the problem may be is old lap marks have slightly changed the texture of the finish in certain spots, and when light is reflecting from it it causes the patchiness that is seen from certain angles. I initially thought it was painting technique, or poor quality paint/equipment but I've tried several methods now and have yet to achieve a uniform finish. For the record, I have recently painted almost an entire house worth of ceilings recently and haven't experienced the same problems.
It could just be the placebo effect, but when I look closely at the patchy parts it does appear to be ever so slightly thicker/rougher than the non-patchy parts.
My question is, is this a recognised problem, and if so, can I sand down these parts and paint over them again? I have got some fine grade sandpaper that might be suitable and a pole sander - or is sanding likely to make the problem even worse? This is the last resort for me otherwise I will just accept defeat and leave the ceiling as is.
Thank you for any help.
After much faffing and research, I think what the problem may be is old lap marks have slightly changed the texture of the finish in certain spots, and when light is reflecting from it it causes the patchiness that is seen from certain angles. I initially thought it was painting technique, or poor quality paint/equipment but I've tried several methods now and have yet to achieve a uniform finish. For the record, I have recently painted almost an entire house worth of ceilings recently and haven't experienced the same problems.
It could just be the placebo effect, but when I look closely at the patchy parts it does appear to be ever so slightly thicker/rougher than the non-patchy parts.
My question is, is this a recognised problem, and if so, can I sand down these parts and paint over them again? I have got some fine grade sandpaper that might be suitable and a pole sander - or is sanding likely to make the problem even worse? This is the last resort for me otherwise I will just accept defeat and leave the ceiling as is.
Thank you for any help.