Should I use scrim tape before plastering these cracks?

[James8869]

I recently took a short plastering course ahead of replastering my house, learned the basic technique but obviously lots of situation I’ve not encountered yet.

Wondering how best to tackle the below problems.

Should I use scrim tape for any of them, or just fill with bonding?

Thanks

 

[Alastairreid]

cracks should always be reinforced with mesh tape, is that wood in the 2nd pic?

 

[James8869]

Ah thanks I’m assuming mesh tape is what I know as scrim tape. Would I put the tape on before the bonding, or after bonding and before multifinish?

Second pic is old plaster with a gap to a pvc window, could pack it full of bonding plaster, but not sure if there’s a better technique.

 

[Alastairreid]

Tape goes on before any plaster.