Mask / Respirator for welding / grinding and spraying cellulose

[Rivertest]

I'm looking for a respirator / mask that will be suitable for MIG welding, metal grinding and cutting and sanding paint rust etc.
I've tried the general disposable sort for grinding etc but my glasses keep misting up

Sooo.. I thought I'd get one the 3M or similar fitted variety.
As far as I can see I've got 2 choices one where the mask is reusable and I could use different filters depending whether I'm metal working or painting, or buy the disposable fitted type.

Some of you are doing this stuff day in day out, can you advise on make, filter type and supplier as I don't want to go overboard on price.

Having said that though I don't want to stint on safety now despite having a used the throw away paper ones for starters

Oh yes and another thing, is it right that the filters only last for 30 days once used?

 

[Chipper]

As for replaceable filters vs chuck-away, I found the replaceable filter 3M one didn't fit my mush. The 3M throw-aways do so I stick with them. If you see paint dust on your chops where it shouldn't be from paint bounce-back, or you can smell anything, it's not sealing (this put another guy in hospital after one session with etch primer). So for paint especially make sure whatever you get, fits and seals.

Old paint masks become great dust masks. Can blow them out with airline for a bit more life too.

 

[Toscane]

How about this one?

3M 8214 Disposable Welding Respirator

This respirator is designed for applications such as welding, soldering and other operations in which metal fumes may be present, including those present with ozone (3M recommended for 10 x OSHA PEL) and nuisance levels of organic vapors (below OSHA PEL). It can also be used in grinding, sanding, sweeping, bagging and other dusty/hot operations. It is especially well-suited for foundry operations, lab settings, undercoating and petrochemical operations. Features the 3M™ Cool Flow™ Exhalation Valve, a cake-resistant media, a comfortable faceseal and fully adjustable straps.

It fits pretty good to my face and straps doesn't bother me at all. I have long hair so some straps(rubber like) tangles in my hair, ****ing annoying to untangle which takes forever...

 

[Wedg1e]

I use a Sundstrom SR100 for most of my work needs:

http://www.arco.co.uk/products/168600

Can be fitted with a range of filters:

http://www.fdcrescue.com/SR100halfmask.htm

Used it with loft insulation, cellulose paint, melting lead, demolition dust, airborne graphite, radioactive particles etc etc...