What Sandpaper To Use To Rub Down Already Glossed Wood?

[jim1980]

I am wanting to apply a nice new white coat of gloss to all the wood work in my house (the current colour is a magnolia gloss that the old owners painted it)
What i want to know is what would be the best grade Sandpaper to use to rub the old woodwork down to allow me to gloss over the top? and do i need to rub all the old gloss off or just give it a light rub to take the sheen off and to make it feel rough to allow the new gloss to stick?

 

[Krispy77]

I usually go with 180 to take the old gloss off, then smooth down with 400.

 

[scottishlad2k10]

I am wanting to apply a nice new white coat of gloss to all the wood work in my house (the current colour is a magnolia gloss that the old owners painted it)
What i want to know is what would be the best grade Sandpaper to use to rub the old woodwork down to allow me to gloss over the top? and do i need to rub all the old gloss off or just give it a light rub to take the sheen off and to make it feel rough to allow the new gloss to stick?

ima painter,dont listen to above!! use a fine sandpaper p60 its just the sheen you are taking off not the paint! when sheens off there is a key for the new gloss to stick to thats what u want if you go for a heavy abrasive paper itl flake chunks off and they will never look right again!!

 

[Krispy77]

Fair play, i'm guessing it's old woodwork that will need a decent rub down first as the old owners probably slapped it on.

Note the word 'usually' in the paragraph as there are lots of variables.

P60 will strip it right back but i'm sure you meant P600 as that's a fine grade. Not sure what stuff you use but i've never taken 'chucks' from paint when rubbing down with p60.....

 

[opps]

Fair play, i'm guessing it's old woodwork that will need a decent rub down first as the old owners probably slapped it on.

Note the word 'usually' in the paragraph as there are lots of variables.

P60 will strip it right back but i'm sure you meant P600 as that's a fine grade. Not sure what stuff you use but i've never taken 'chucks' from paint when rubbing down with p60.....

Echoing Krisp77

I would use 180 or 240 silicone carbide paper.

Although 180g aluminium oxide and 180g silicone carbide are supposed to be the same grain size you will probably find that the former is more aggressive than the latter.

I am recommending 180 sil carbide because I guess that the existing paint is not 100% perfect. The 180 will be a large enough grain to sand without the paper clogging too quickly and will enable you to flatten imperfections.
The scratch marks will be shallow enough to be filled by the undercoat.

If you need to apply more than one coat of gloss and that you want to sand between coats the use webrax or a 400ish grain silicone carbide. Ensure that the paint has dried for a couple of days otherwise the surface might ripple/rip.

p60 paper is extremely rough and will leave deep scratches that will require subsequent grades to remove the scratches- by which time you will be back to the wood

I guess everything is relative but if Scottish lad thinks p60 is a fine grade then perhaps he uses Napalm for the stubborn paint!!!

 

[scottishlad2k10]

Fair play, i'm guessing it's old woodwork that will need a decent rub down first as the old owners probably slapped it on.

Note the word 'usually' in the paragraph as there are lots of variables.

P60 will strip it right back but i'm sure you meant P600 as that's a fine grade. Not sure what stuff you use but i've never taken 'chucks' from paint when rubbing down with p60.....

Echoing Krisp77

I would use 180 or 240 silicone carbide paper.

Although 180g aluminium oxide and 180g silicone carbide are supposed to be the same grain size you will probably find that the former is more aggressive than the latter.

I am recommending 180 sil carbide because I guess that the existing paint is not 100% perfect. The 180 will be a large enough grain to sand without the paper clogging too quickly and will enable you to flatten imperfections.
The scratch marks will be shallow enough to be filled by the undercoat.

If you need to apply more than one coat of gloss and that you want to sand between coats the use webrax or a 400ish grain silicone carbide. Ensure that the paint has dried for a couple of days otherwise the surface might ripple/rip.

p60 paper is extremely rough and will leave deep scratches that will require subsequent grades to remove the scratches- by which time you will be back to the wood

I guess everything is relative but if Scottish lad thinks p60 is a fine grade then perhaps he uses Napalm for the stubborn paint!!!

give me a rest man!! dont look at the screen while typing & the 1 key on my keyboard is playing up! dosnt work when i want it to and works when i dont want it too =[ p160 <<<<<correct woohoo!

 

[opps]

Fair enuff

I couldn't work out why you posted in so many threads that p80 was fine.

I knew you scots are hard but not that hard.

Cheers

 

[Krispy77]

Opps, you're right with silicone carbide. Should have said that and not presumed. Works a treat every time.