Sealing new shower tray

[Puzzled85]

Sealing a shower tray

I'm fitting a new shower, 3 walls and a sliding door in a frame. The tray will be tanked to the wall with tanking tape, then tiled. I've read in a few places to seal the between try the tray and tile where the frame meets the wall before adding the door frame so that water can't get behind. That bit I get. What I'm struggling with is after fitting the frame I should seal around the outside of it. But on the bottom corners it will be silicone over the first silicone seal. I keep reading silicone doesn't stick to itself, so is this correct?

 

[Wayners]

One guy I follow says yes. You can apply silicone over silicone.
Here is the test to prove it

I also follow another guy that you may find helpful

Checkout both channels as imo the best ones

 

[Puzzled85]

Thanks, makes sense because everything says to seal the tray. Then fit the door frame then seal the out side. So confusing with the contradictions

 

[Wayners]

Skillbuilder also made some interesting videos on YouTube about resin trays and common mistakes when fitting.
There is some conflicting opinions and bad practices it seems.

 

[opps]

One guy I follow says yes. You can apply silicone over silicone.
Here is the test to prove it

I also follow another guy that you may find helpful

Checkout both channels as imo the best ones

The silicone work in the first video is shockingly bad when viewed on a high definition laptop screen. I do however watch some of his videos.