How to sand and seal doors and windows?

[Innov8tive]

For this project I'm needing to buy the right sander for the job - one that gets into small corners and tight grooves as much as is possible with a sander. I'm just wondering what you recommend the best sander to be. I do prefer sanders that have a catcher. 

I'm also wondering what would be best to get for a nice sealing of the doors a d windows after sanding. 

 

 

[Innov8tive]

@MitchellMc 

Thanks so much. I think.the issue was me. Had internet issues and didn't realise it. All fixed now and was able to post pics. Thanks again.