Of course you check fuses first, I do visual/multi-meter inspection, always and every time to my fuses.
I assumed that you have already done inspection of fuses...
Cotton swab, small wood splinter, piece of cable tie, piece of metal wire, bend paper clip, use your imagination for apply tool.
My tube of dielectric grease has opening of 8mm, pressed the tube little bit, so that opening is filled with grease and I sticked fuse 'legs' to grease.
No any kind of application tool required.