Correct steps

[01somta]

I am ready to spray my etching primer, undercoat (raptor liner), and lay some seam sealer (lord fusor 122EZ). I was going to do this in a two night process. The first night scuff and spray the etching primer to just seams and then apply the seam sealer. Coming back the next evening and scuff/degrease and prime the entire undercarriage, then spray my undercoat. My question is can I spray the etching primer over the seam sealer that I put down the night before? Or, should I scuff/degrease everything on the undercarriage and then apply the etching primer over the entire undercarriage and then apply the seam sealer, come back the next night and rescuff the primer and apply my undercoat.