What are the benifits of epoxy only (no 2k)

400 is finish paper. hard block or not it will follow the contour of the panel. it will not cut flat period.
 
shine;9330 said:
400 is finish paper. hard block or not it will follow the contour of the panel. it will not cut flat period.
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ok, thanks for the help.

does the same thing apply to clear? should I start with 400, or something rougher?
 
400 is pretty much useless for blocking . it just gets rid of 320 scratches. once you get to clear go no lower than 600.
 
ok, I was planning on hand blocking the clear with 800, but I might see how it goes and have some 600 on hand. once I get rid of the shiny, I'm going to use a random orbit sander with 1200 on the flat parts, by hand on the curves, after that I'll buff with a wool bonnet
 
I was planning to go after my first clear session with 320 dry, then flow coat and go from 600 on the second round. Good or bad idea?
 
suction from the water/mud draws the paper into the wave. only way around it is adhesive on your block. you can still buy adhesive like was used in the days before hookit and self stick. no matter how hard you try you cant keep the paper tight.
 
I never thought that paper sucked off the block would still cut. That is interesting, I will have to think about that and observe.
 
What about a hookit sanding block? In theory that should be a lot better
 
Crash,

I don't think it really cuts much at all, but just enough to take off the shine, making the user believe that the panel is flat when it isn't.
 
it still cuts just as much. pressure on the block is no more than the suction. you should be putting little pressure on it anyway.
this is why the wave shows up in buffing even after blocking it . how did the peel get blocked out in the wave ????? :)
of course this is just my opinion and worth just what you paid for it.
 
My logic was the hookit setup would keep the paper flat against the pad, in theory keeping the paper from being pulled away from the pad
 
I have a large supply of hookit in 100, 120, 400, 800, and 1200. I stocked up
 
This about half of my collection

2011-04-29_12-20-33_945.jpg
 
you can stick them on a block but it's pretty wasteful. i block with a 9 in. block. most of my sanding blocks are home made . i use sheet paper until 1000 . then back to sheet paper to finish out for trizac .
 
its just known fact you cannot block a large panel with a circular block or da and achieve the results as you would with a long block. you need to longest block possible to go across the panel...wether you are blocking bondo, primer, or even clear.

with a da, or that "block", all you are doing is smoothing out the surface with those grit papers....you arent blocking or leveling. only time i use a da, is with 3000 grit finishing out clear, or 40 grit shaping filler or knocking the rough off.
 
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