Can I stain wood that's already been stained?

In this video I use gel stain to put a grey weathered look on a piece of furniture, without sanding off the existing finish!

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Listed below are the products (or their equivalents) I used to achieve this effect!

TSP cleaner / degreaser
https://www.amazon.ca/SamaN-44108-28-Ounce-Cleanser-Degreaser/dp/B004TTTVWQ/ref=sr_1_5?keywords=tsp&qid=1590101032&sr=8-5

Sanding sponge
https://www.amazon.ca/3M-Angled-Sanding-Sponge-Fine/dp/B00004Z4AV/ref=sr_1_28?crid=9IYWTALSDX4U&keywords=sanding+sponge+120&qid=1590101156&sprefix=sanding+sponge%2Caps%2C293&sr=8-28

Brushes
https://www.amazon.ca/Magnolia-Brush-233-Single-Thickness/dp/B00CXCFUOY/ref=sr_1_3?keywords=2%22+chip+brush&qid=1590101318&sr=8-3

Primer
https://www.amazon.ca/Rust-Oleum-2004-White-Zinsser-Primer/dp/B019F69230/ref=sr_1_2?crid=2ROZ46WDU8039&keywords=bullseye+123+primer&qid=1590101251&sprefix=bullseye+123%2Caps%2C272&sr=8-2

Gel stain
https://www.amazon.ca/General-Finishes-GRP-Base-Stain/dp/B00YCLBLXI/ref=sr_1_1?crid=2O5IQF29VTFC0&keywords=general+finishes+grey+gel&qid=1590101410&sprefix=generl+finishes+grey+%2Caps%2C243&sr=8-1

Clearcoat options
Rustoleum
https://www.amazon.ca/Rust-Oleum-200161H-Water-Based-Polyurethane-Semi-Gloss/dp/B000LNRYG4/ref=sr_1_6?keywords=rustoleum+polyurethane&qid=1590101487&sr=8-6

Minwax
https://www.amazon.ca/Minwax-63025-Water-Based-Polyurethane/dp/B000RNNF2K/ref=sr_1_4?keywords=minwax+polyurethane+semi+gloss&qid=1590101562&sr=8-4

Видео Can I stain wood that's already been stained? канала Rustic Duck Furniture