final grit for body filler?

S

Steves69LS3

hey guys

before laying down 2k high build, what should my final grit on the body filler be? right now it is sanded to 80 grit
thanks a bunch

Steven
 
We sand to 150. Some go with 180. You have to plan your blocking to leave enough material on the surface to do this, because if you have metal high spots already they will really be proud when you finish with 150-180. I like to block with 80-100 until any high spots is just BARELY peeking through, then finish with 150.

As a matter of fact, on production jobs where the panel will see paint in the next couple of days, we will even refine the 150 out with 220 and a red scotchbrite pad. This ensures that the primer shrinkage that occurs will be much less visible.
 
I usually finish my blocking of my glazing putty with 180, contour my glaze with 80..I then throw on an interface pad on my d/a and buzz the panel with 180. I find this helps to step up the scratch and make the surface entirely uniform. I then thoroughly clean the panel, epoxy prime, and then apply my poly spray or urethane, depending on the conditon of the panel, and how good the job has to be.
 
180 minimum is suggested for most urethane or epoxy primers, polyester primers can go over 36 grit scratches
 
since i mostly have everything finalized at 80 grit is it suitable for high build to cover? i do have some bare metal spots that i will have to hit again with epoxy but from reading here the epoxy likes 80 grit
 
You've been advised against it by several members, but it seems like you are pretty set on spraying it with 80 scratches. If that is the case, at least put a coat of epoxy on the whole thing, then wait a day to spray your 2K.

The 80 grit/epoxy rule is for large bare metal areas, it doesn't apply to later stages.
 
well i do have some glaze i can put down and do my finalizing sanding with 180 its no problem at all

but thank you for all of the suggestions i will report back shortly when completed
 
flynams;12064 said:
Sorry, but never go over 36 scratches with any primer
Click to expand...
LOL, yeah I don't but I know some do use polyester primer over nasty scratches like that and don't have problems, I've done it also but there's no sense pushing a product to it's limit. Same goes for urethane surfacers-I know some do shoot over 80 grit scratches and say they have no problems but I've seen them show everytime I've tried-sometimes it takes a year but they always show up for me. 180 or finer is a good rule to follow for any surfacer.
 
years ago we used to prime over 80 grit with lacquer primer, but look out if it got chipped later. sure could get nasty looking. I like to glaze it and finish it out with 180. looks like I finally am doing it right, or we are all wrong.lol
 
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