Have just applied second coat of gloss paint to one area and first coat to another: and the paint has immediately developed small dimples all over the surface ~ like orange peel. What has caused this? What will correct it? New brush used, dulux gloss paint used, surfaces clean and dry, second coat applied over first coat, first coat applied over undercoat/primer. Have been glossing for years and not met this problem before. Help!!! Daren't do any more until advice received !!!