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#580810 - Tue Oct 06 2009 01:10 AM Dura blocks and what grit sand paper?  
smokey_truck  Offline
Shop Shark
Joined: Oct 2007
Posts: 412
Fairfax
I wanted to buy Durablocks, I needed to buy sand paper those long ones sticks to Dura block. I thought 180 grit to sand Bondo and body work and 800 grit for primer

Is that correct or do I need to buy different sand paper for the bodywork

I am at bare metal now!!

Ganesh



#580813 - Tue Oct 06 2009 01:16 AM Re: Dura blocks and what grit sand paper? [Re: smokey_truck]  
Glennc  Offline
New Guy
Joined: Oct 2009
Posts: 9
Mobile, AL
You can use 80, 180 or 320 on the long blocks. You can use 800 on the primer but deoending on how thick it is, ou may be there a while. Sand the primer with 180 to remove the previous sand scratches and then primer the part again. Then watersand the primered parts with 400 wet/dry sand paper. You will get a very smooth paintable surface without any sand scratches.


#580816 - Tue Oct 06 2009 01:22 AM Re: Dura blocks and what grit sand paper? [Re: Glennc]  
smokey_truck  Offline
Shop Shark
Joined: Oct 2007
Posts: 412
Fairfax
I am taking notes, I am going to sand the metal to leave 80Grit scratches and do a epoxy primer the bondo job, from there I was wondering what sandpaper so I thought 180 might be good but I am reading your notes and collect all of them. I need to have nice and smooth paint but I was lost with the sand paper.

Thanks Glennc

Ganesh

Last edited by smokey_truck; Tue Oct 06 2009 01:24 AM.

#580952 - Tue Oct 06 2009 02:42 PM Re: Dura blocks and what grit sand paper? [Re: smokey_truck]  
Hankdogg  Offline
Shop Shark
Joined: Sep 2007
Posts: 631
South Carolina, Go Gamecocks!
You may want to consider using 40 grit to do the initial sanding on the body filler as it will cut it down quicker, then go to 80 grit and finally 150-180 grit before primer. Start with 220 and go up to 400 on the primer. Maybe higher depending on what type of finish coat paint you intend to use. Just my 2 pennies.

Hank


1951 restoration on website
~~~~~~~~~~~~~~~~~~~~
http://www.hanklong.com

#580963 - Tue Oct 06 2009 03:20 PM Re: Dura blocks and what grit sand paper? [Re: Hankdogg]  
jpmanyhearts  Offline
Wrench Fetcher
Joined: Mar 2008
Posts: 71
Montana
if your at bere metal now you will need to metal condition the metal first then hammer and dolly all your highs and lows or metal file your dents then use an epoxy primer then what i use is a high build primer it sprays on really thick so it levels out really good but when you get you panels straight then shoot your primer surficer on because that hibuild will recoat react with your paint. Start with 80 then 180 then 220 then 320 400 500 600 never go more than 100 each time you sand. let me know if you need any thing else and let us know how it turned out


Jer's Rods & Customs

#581011 - Tue Oct 06 2009 05:33 PM Re: Dura blocks and what grit sand paper? [Re: jpmanyhearts]  
smokey_truck  Offline
Shop Shark
Joined: Oct 2007
Posts: 412
Fairfax
Thanks JPmanyhearts, I was wondering why we need that much of sanding, I thought if you lay the primer and if there are not low and high spots, is it not enough to sand with 180 and 800. Will that not make the surface smooth.

But lot of good information and will try to buy enough of sand papers I guess

And should all of them be wet sanding?

Ganesh


#581027 - Tue Oct 06 2009 06:01 PM Re: Dura blocks and what grit sand paper? [Re: smokey_truck]  
Glennc  Offline
New Guy
Joined: Oct 2009
Posts: 9
Mobile, AL
Dont wetsand the bondo itself. Use 40,80 or 180 to get the bondo correct first. Then prime it. Then wetsand with the other finer grit papers. When I paint something I never go above 400 wet sanding before I spray it. It leaves the old paint and primer very smooth and makes a real good paint job. Once you have it painted, the use 1500 to 2000 grit to color sand the paint before you high speed buff it and wax it. Good Luck.


#581050 - Tue Oct 06 2009 06:58 PM Re: Dura blocks and what grit sand paper? [Re: Glennc]  
smokey_truck  Offline
Shop Shark
Joined: Oct 2007
Posts: 412
Fairfax
Thanks Glennc, lot of learning!! I need to get atleast one panel done I guess.

Ganesh


#581267 - Thu Oct 08 2009 02:44 AM Re: Dura blocks and what grit sand paper? [Re: smokey_truck]  
jomichael  Offline
Shop Shark
Joined: Jul 2005
Posts: 1,045
Vero Beach, Florida
I sprayed my sandblasted panels with epoxy awhile ago. I rough sanded the epoxy with 80 grit to see where my highs and lows are (shiny metal high, epoxy low). Now I'm currently applying and sanding filler on my truck. I find that 80 grit is good at knocking down the filler, then I switch to 120. I plan on going to 220 then applying anther coat of epoxy. Then I will spray a couple coats of 2k. Then start blocking with 220 or 320. A final blocking with 400. After that I am in foreign territory.



#581427 - Thu Oct 08 2009 04:35 PM Re: Dura blocks and what grit sand paper? [Re: jomichael]  
marklaken  Offline
New Guy
Joined: Jul 2009
Posts: 89
fort collins, CO
make increments of no more than 150 grit jumps - it will reduce your effort and cost you less in the long run

36/40 grit discs on DA will knock down existing paint and scuff for filler.

80 grit adhessive paper on blocks is great for shaping filler and smoothing the 36/40grit DA body sanding

(optional sanding with 120 grit will save you a bit of time and effort on shaping filler/glaze prior to smoothing - not necessarily adhessive paper - I use the red paper from home depot - it's cheaper)

180 grit adhessive sandpaper on blocks is great for smoothing filler/glaze and is also good for smoothing the 80 grit sanding on old paint

(optional sanding with 220 grit here to reduce effort especially at sand scratches near filler locations - again i use the home depot paper here)

then I jump to 320 grit adhessive sandpaper paper on everything (filler and old paint) prior to high build primer (I also use 320 grit home depot paper on small blocks to save some $)

sand high build with 320 grit followed by 400 grit prior to sealer and topcoat (follow your paint's recomendation - most these days say 400 grit)

600, 800, 1200, 2000, 3200 grits for wetsanding/colorsanding topcoat - none of these are adhissive sand papers - just fold 'em around small blocks...




Last edited by marklaken; Thu Oct 08 2009 04:39 PM.

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