Painted the skirtings and arkis in the bedroom 6 months ago with Johnstones brilliant white eggshell lustre mid sheen. Ive just been to touch a scratch up and can now see that the colour has deteriorated to a yellowy/cream colour. Ive e-mailed them expressing my dissatisfaction at their product, but what can you reccommend i re paint them with that will stay white and be a satin finish.