Sandpaper Questions

[devilgti]

Hi guys,
I have been parting along with my restoriation for a few weeks so far and have came across a problem today. I bought some 80 grit sandpaper (Norton brand) and it says "Waterproof" which I had the intention of sanding the filler work in the required areas. I had asked for wet & dry and this is what they gave me.
However, a friend of mine was assisting me today and told me that this sandpaper is not correct for the job. He suggested buying "Wet and Dry". What is the difference between "Waterproof and Wet & dry" sandpaper???

What should I be using???

 

[TAZ]

I am assuming that your restoration is on a metal car/truck or something like that. If this is the case you want to use all "dry" paper. You don't want to be getting the bare metal wet (assuming that is why you wanted wet and dry paper to "wetsand with"). Plus the bondo will absorb the moisture, and then you'll end up with a rust problem.

Now, if you are restoring a fiberglass car, you'll be fine to use wet paper. I personally have never used 80 grit wet and dry. I've always used 80 dry.

Wet and dry means you are supposed to be able to use it both wet and dry. Most of the time when it says this, it's really meant for 'wet' sanding.
Not for sure what "waterproof" means in sandpaper language. I would think it would be the same as wet and dry paper.

The coarsest wet and dry paper I've used is 800 grit.

 

[devilgti]

I am assuming that your restoration is on a metal car/truck or something like that

It is a bare metal restoriation. Using small amounts of body filler to smooth out repairs, all dents have been knocked out with a hammer and dolly.

I worked on the car today and noticed that when using a "waterproof" paper, I have found that it clogs up very quickly. I was told if I used a "wet & dry" paper but only using it dry, the paper will not clog easy, hence getting more use from it.

Not for sure what "waterproof" means in sandpaper language. I would think it would be the same as wet and dry paper.

I thought this was the case, but it seems not!!

 

[TAZ]

Yes, that is true, when using wet and dry paper as a dry paper, it will clog up more quickly than the regular paper.

You want to use only the 'dry' type paper all the way up to when you paint it.