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Wet Sanding Vs Dry sanding?

Started by _Viper_ , Dec 29 2009 08:33 PM

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10 replies to this topic

#1 _Viper_

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Posted 29 December 2009 - 08:33 PM

Hey... I always thought you had to wet sand when your blocking primer ready for paint but a friend told me they usually dry sand at work...

I tried dry sanding ages ago but it clogged up the paper really quick... he said thats cos it was acrylic... 2pak is hard so it wont clog as much...

So yea just wondering what you all think I should do when block sanding my primer.... Wet or dry... and pros/cons of both...

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#2 TerrA LX

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Posted 29 December 2009 - 08:47 PM

I thought paper clogs because the primer heats up too much from all the rubbing, I usually blow it off before it clogs if Im howing in.

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#3 _2runa_

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Posted 29 December 2009 - 08:54 PM

I find when using 2-pac primer/filler..... dry to 600 ok depending on the finish you require 1200-2000 wet when finishing 2-pac color or clear but every man to his own

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#4 _yldlj_

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Posted 29 December 2009 - 09:06 PM

we only dry rub primer at work aswell wet rubbing is old and is more for acrylic

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#5 _Viper_

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Posted 29 December 2009 - 10:13 PM

My friend said they have special blocks which have a vacumme attachment and their paper has holes in it as well so there is no dust... Would that be a problem if you dont have a extraction system... (causing it to clog more/scratch the primer)

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#6 _yldlj_

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Posted 29 December 2009 - 10:33 PM

them blocks are shit they use them at tafe right? yeah they are only if you have an extraction setup and you have to use te velcro sanding paper. i would be using those wide blocks with the metal clip tat holds the paper in there the best for rubbing back big panels.

Edited by yldlj, 29 December 2009 - 10:34 PM.

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#7 _Bomber Watson_

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Posted 30 December 2009 - 05:34 PM

I do most of my sanding dry.

Always with an air blower in my spare hand, blow frequently (mind out of gutter guys).

I think that Wet paper is easyer to finish with though, so block back till its all pretty good with dry then re guide coat and wet rub with 600-800......Thats what i do

Cheers.

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#8 Heath

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Posted 30 December 2009 - 05:44 PM

My experience is mostly with acrylic, but yeah I use it all the time. I normally start off and do the first third of the task with course dry paper and do the next two thirds with finer wet paper, applying layers of paint etc amongst the later part mainly.

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#9 71xu1

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Posted 02 January 2010 - 07:10 PM

Lots of debate on wet vs dry. Both have there pluses. I prefer wet Im more old skool though what I mosly like about wet is you don't breathe in all the dust. But in saying that if Im knocking back a car after it has been 2k primed I usually use 120 to 180 on a speedfile dry then prime again and then wet rub ready for the topcoat. The trend now in most shops is to dry rub its a lot quicker with a DA sander.
Cheers Dave

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#10 _yldlj_

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Posted 02 January 2010 - 08:17 PM

thats what we do at work we will just use the DA on it unless its a big repair then we would block it out but thats only because we don't have the time to be reapplying primer. the reason we dont't wet rub is because it's so messy especially when you have 6 or 7 cars lined up and you have water around them all. when you prep you should have a mask on so the dust isn't a problem

Edited by yldlj, 02 January 2010 - 08:18 PM.