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tips and trick with bondo

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Russ:
Hey guys it is me again needing help what is new. I am trying to smooth in my quarters and kind of a newbie with Bondo and need some tips on how much how to put it on there and what to and not to use when taking it off. I have a body file and a da and of course my hand. I am in a bind and any help would be an improvement. I am hoping to really get some help, Thanks. STANG OUT

racedraper:
you need a good sanding block. something that can match the contours of the body. Dont mind that your car has bondo, cause all of you high end cars apply a thin coat so that it can have a perfect look. also there is a primer called slicksand, its super thick when applied and fills in any bad spots.

this is a link for the type you need for sanding
http://images.google.com/imgres?imgurl=http://www.route66supply.com/store/media/afsbanner2.jpg&imgrefurl=http://www.route66supply.com/store/page50.html&h=159&w=264&sz=19&hl=en&start=16&um=1&tbnid=0N5YqTZrr8wS0M:&tbnh=67&tbnw=112&prev=/images%3Fq%3Dcar%2Bsanding%2Bblocks%26svnum%3D10%26um%3D1%26hl%3Den%26client%3Dfirefox-a%26rls%3Dorg.mozilla:en-US:official%26hs%3DE8S

Thierry:
Don't use bondo over rust. I did it once and the rust came back in less than a year even with most of the rust sanded off. Bondo has to be applied on solid metal, free of dust and grease. You can clean the panel with paint thinner. The thickness of the bondo has to be less than a 1/4 inch or it will crack.
Hotrod magazine published an article about it and said that Metal putty has superior qualities than regular bondo. It can be drilled and tapped and paint adheres to it better.
I will try to find the article and let you know if there is more about it.

KarenCaren:
I got this from a website. I hope it helps.

Bondo Mixing Tip:  I like to mix my bondo on a piece of flat glass. I use an old side window from my truck. It will not absorb any of the bondo (don't use cardboard) and is easy to clean. I put a ball of bondo on the glass and a proper length of the hardener next to it. I use two of the yellow spreaders about 4 inches long to mix it. Use one and then use the other to wipe it off the first back onto the glass until mixed. After putting the bondo on the car I scrape any left over off of the spreaders and the glass with a 1" wood chisel. Then I take some paint thinner on a paper towel and finish cleaning the glass, spreaders, and chisel. Believe me if you keep all of this clean you will do a better job. If not you will get chunks of old bondo in the new on the car and if your spreaders aren't clean and straight edged you will drag grooves in the new bondo as you spread. (Note: these type of tips are going to make this longer, but I don't see this stuff mentioned in the books and it can really help speed the process up and make it less frustrating, so bear with me or skip over my tips).

rmodel65:
a great mixing board for filler is an alum sign(i dont condone the taking of street signs) when it gets built up you can either bend it to pop it off or take the sander to knock it down

a "cheese grater" work great to get it all knocked down before sanding, you do this before it hardens but not while its still wet

i normally use 80 grit to start then 220 then 320 then i prime block with 400 then 800grit

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