Hi, am in the process of nailing up 25 mm thick 'Kingspan Thermospitch' sheet panels ( they are foam panels with the two outer faces covered in aluminium foil) to the inside of my loft joists to form an internal ceiling.
I want to paint them with white emulsion paint. What primer, if any; (preferably water based) should I use to put on the aluminium please? Or is a primer not really necessary? thanks.