hden, I have found pure glycerin to be helpful. You simply spread it on in a thin sheen, wait a few minutes, then blot off the excess. Try doing this twice or three times a day. I have never heard of anyone covering up the lesions after applying glycerin. If you need to apply glycerin across a wide area you can use a spray bottle with glycerin diluted by 20-30% with either water or witch hazel. Although I have read of rather startlingly good results, glycerin's impact on my psoriasis has been relatively minor and didn't really come through until after 2-3 months. Still, I certainly recommend it. It is soothing, cuts down on flaking and inflammation (redness).
Most folks on this forum believe tackling psoriasis from within is generally more effective than using anything topically, although certainly doing both sounds best. I suggest exploring dietary alternatives, especially wrt eliminating possible psoriasis trigger foods (gluten, dairy). Probiotics may help also, especially if done naturally (by making your own yogurt or sauerkraut).
_Lazza