I have just bought Indeed Retinol reface. Advice seems to be to use a sun cream daily, so i have bought soltan once face spf 30. Does anyone else use this and can I use a serum under it. Can I ask if any Retinol reface users would be kind enough to tell me which sun cream they use. Trying Retinol reface for wrinkles, might have left it too late as I've hit the big 5 0.