Lick paint on gloss

Lay appropriate protection in areas working.
Sand down areas needed with 180 grit sandpaper.
Then wipe over the woodwork with acetone or nail polish remover.
Then apply a primer/undercoat.
Let dry then gloss woodwork.

Priming is only used for restoration or of the wood had completely been sanded down or professionally burnt away.
Always light sand when painting, it's common practice time and you get a much better finish. Use a fine graded sand paper so you don't start making big scratches in existing paint as this will be noticeable on the finish

I would always sand and prime any woodwork before painting with gloss

Yes always sanded and primed.

the first coat must be applied with undercoat and then with finishes

Dont necessarily need to prime ,Its probably been glossed over emulsion on woodwork .

Best off using heat guns and sanders to remove the gloss first

Assuming the old coat of gloss is oil based, it will need flattening with sandpaper followed by 1 coat of Zinsser B-I-N to adhere to the gloss, then lightly denib the dried primer and you're good to apply Lick on top.

It would've been better to use satin wood I've only used lick for the walls and ceilings

If you sand off the majority of the gloss paint then you can regress without using a primer

Always sand the woodwork with 180 grit sandpaper then wipe down then undercoat once dry lightly sand again then gloss over

Yes,should be sanded and then primed.

Yes it is safe. If it still then re coat it again.

It's always best to follow the manufacturer's guidelines when using a specific paint product, but in cases where you're painting over glossed surfaces, it's generally recommended to follow standard preparation practices to ensure optimal adhesion and longevity of the paint finish.

While the Lick paint you're using may claim to be multi-surface, glossed surfaces present a unique challenge due to their smooth, non-porous nature. Simply sanding the surface may not provide enough "tooth" for the new paint to adhere properly, especially if the gloss paint is in good condition and not peeling or flaking extensively.

In line with good practice and to achieve a professional standard, here's what I would recommend:

1. **Clean the Surface:** Start by thoroughly cleaning the glossed surfaces to remove any dirt, grease, or contaminants. Use a mild detergent and water solution and allow the surfaces to dry completely.

2. **Lightly Sand:** Lightly sand the glossed surfaces with fine-grit sandpaper to roughen up the surface and provide better adhesion for the new paint. This step helps to create a more porous surface for the paint to grip onto.

3. **Prime the Surface:** After sanding, apply a suitable primer specifically formulated for use on glossy surfaces. This will help to further promote adhesion and provide a stable base for the topcoat of paint. Make sure to choose a primer compatible with both the existing gloss paint and the new paint you'll be using.

4. **Apply the Paint:** Once the primer has dried according to the manufacturer's instructions, you can proceed to apply the Lick paint as directed. Follow the recommended application techniques and allow each coat to dry fully before applying additional coats.

By following these steps, you'll help ensure that the Lick paint adheres well to the glossed surfaces and provides a durable, professional-looking finish. Taking the extra time to properly prepare the surfaces will ultimately lead to better results and a longer-lasting paint job.