Painting Emulsion Over a Dark Colour

[MysteryMan]

I am planning to decorate my son's room with white matt emulsion. 3 walls are fine and will cover easily (I hope!) However, the 4th is a shiny deep purple colour.

I have tried a small area with brush and Johnstone Coverall Vinyl Matt, but, can still see the original colour slightly and don't think this will be acceptable.

Question 1) Do I need to sand it down first?

Question 2) Should I be looking to use a primer before attempting the final coats? If so, what are suggestions to use?

Many thanks!

 

[opps]

No need for a primer.

You may need 4 coats of your paint.

 

[Notch7]

I am planning to decorate my son's room with white matt emulsion. 3 walls are fine and will cover easily (I hope!) However, the 4th is a shiny deep purple colour.

I have tried a small area with brush and Johnstone Coverall Vinyl Matt, but, can still see the original colour slightly and don't think this will be acceptable.

Question 1) Do I need to sand it down first?

Question 2) Should I be looking to use a primer before attempting the final coats? If so, what are suggestions to use?

Many thanks!

If you are going from dark to light, I would paint it with a decent Matt white first as it’s cheaper than colour generally and white as a base won’t influence the new colour at all

 

[MysteryMan]

If you are going from dark to light, I would paint it with a decent Matt white first as it’s cheaper than colour generally and white as a base won’t influence the new colour at all

Thanks, but, I have painted a small area with 3 coats of a very good Matt white and still not covered well!

 

[opps]

Thanks, but, I have painted a small area with 3 coats of a very good Matt white and still not covered well!

No criticism intended... but... 4 coats of a decent emulsion applied with a decent roller should cover even black.

Over the years, I have known people that have applied light grey over black before painting it white- that really shouldn't be necessary.

 

[MysteryMan]

No criticism intended... but... 4 coats of a decent emulsion applied with a decent roller should cover even black.

Over the years, I have known people that have applied light grey over black before painting it white- that really shouldn't be necessary.

OK, thanks.

Do you think sanding it to remove shiny finish would help?

 

[opps]

OK, thanks.

Do you think sanding it to remove shiny finish would help?

It may help but again, I think it is down to the roller that you are using or your technique- again, no criticism intended.

My roller sleeve of choice is the Purdy Colossus. Keep the sleeve loaded with paint for maximum coverage

 

[Notch7]

OK, thanks.

Do you think sanding it to remove shiny finish would help?

No need to sand if it’s vinyl silk

Might be different story if it’s oil based gloss

 

[MysteryMan]

No need to sand if it’s vinyl silk

Might be different story if it’s oil based gloss

Pretty sure not gloss and is an emulsion! Will try with roller to see if that's better