Should you sand between paint coats?

[DIYHaveaCrack]

A 'to sand or not to sand' question. I'm repainting my bedroom walls in a colour similar to the existing colour. The walls are in good condition (or will be once I've done all my cleaning, sanding and plugging holes prep). My question is do I need to do a light sand between coats. I'm using Dulux Wash and Wear Low Sheen. I'm thinking that if they look smooth under good light after the first coat I might not need to sand in between. I want to do this properly but also don't want to create unnecessary work for myself.  If yes, what grit should I use (I use a combo of orbital sander and hand sanding). Having said that I will defininitely do a light sand between coats on the trim so also wanted to check what grit you would suggest for that. Thanks.

[EricL]

Hello @DIYHaveaCrack 

When I repainted my walls many moons ago, I made sure that the walls were very well sanded and clean. I also made sure that my paint roller was washed properly with all the loose lint removed. One of the reasons your first coat could look messy is because of a messy environment such as sanding dust and saw dust on the floor which could be kicked up into the air as you shuffle around the room. Strong wind coming into the room also brings in dust and debris that could go on your freshly painted wall.

Having the room clean and tidy will reduce the likelihood of contaminants going to your wall. I propose observing your first topcoat, if it seems that surface is clean and flat you should be able to put the second coat on without having to sand the surface. Unless the paint product you're using specifically states that you must sand the first coat then its best to follow the paint manufacturer's instructions.

My best advice is to give the first coat enough time to properly cure before putting on the second coat.

Here is a handy step-by-step guide: How to paint like a professional by @Peggers 

If you have any other questions we can help with, please let us know.

Eric