My old trusty ( probably too old ! ) 3M face mask/respirator is shot. What is a good model to replace it with ? Need protection from sanding mid 70's OLD SeaCraft lay-ups

- the majority of it's use, spraying paint as well as spraying Awl-grip.
The one I have is 15 years old - a 3M 7281.
Looking for the under $40 type - not a full face mask.
I'd rather hear from a pro than assume anything when it comes to my respiratory system.