Gloss undercoat sanding...

[AND1234]

Today I used Dulux Prof Undercoat Gloss on my bedroom skirts and door frame.
Ive noticed a few imperfections whilst its drying such as dust and missed bits of sanding...

My question is...
Can I (tomorrow) sand said areas and re undercoat?
Its just the tin says One coat of undercoat and 1-2 coats of top gloss.
Can I re-undercoat the lot or just "touch up" effected areas.
Or should I go straight to Top coat after the sanding. Hope this makes sense to someone...
Thanks in advance...

 

[stomach]

You can touch up the area or paint the whole thing again with undercoat after you sand it.

Then apply one coat of gloss. If it hasn't 'covered' then give it another coat of gloss.