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Prime first or filler first ??? #1656037 08/07/14 04:52 AM 08/07/14 04:52 AM
Joined: May 2007 Posts: 269 BC Canada 6 62440 OP enthusiast
62440 OP enthusiast 6 Joined: May 2007 Posts: 269 BC Canada	I'm doing some body work and would like to hear your opinions as to which should come first. Primer or filler ??? Or does it matter ?

Re: Prime first or filler first ??? [Re: 62440] #1656038 08/07/14 11:36 AM 08/07/14 11:36 AM
Joined: Oct 2005 Posts: 8,873 Ontario, Canada S Stanton Don't question me!
Stanton Don't question me! S Joined: Oct 2005 Posts: 8,873 Ontario, Canada	It matters! Prime first.

Re: Prime first or filler first ??? [Re: Stanton] #1656039 08/07/14 02:15 PM 08/07/14 02:15 PM
Joined: Feb 2003 Posts: 12,675 Columbia, CT M moper I Live Here
moper I Live Here M Joined: Feb 2003 Posts: 12,675 Columbia, CT	I use etching primer, then filler, then high build primer. Well, art is art, isn't it? Still, on the other hand, water is water! And east is east and west is west and if you take cranberries and stew them like applesauce they taste much more like prunes than rhubarb does. Now, uh... Now you tell me what you know.

Re: Prime first or filler first ??? [Re: 62440] #1656040 08/07/14 02:29 PM 08/07/14 02:29 PM
Joined: Dec 2007 Posts: 18,157 Mass DAYCLONA I Live Here
DAYCLONA I Live Here Joined: Dec 2007 Posts: 18,157 Mass	metal work, then filler, then etch primer, or epoxy coat, then high build primer, then sealer and/or base color/clear coat, or single stage depending on the requirements....been doing it this way for 35+ years

Re: Prime first or filler first ??? [Re: moper] #1656041 08/07/14 02:32 PM 08/07/14 02:32 PM
Joined: Jan 2012 Posts: 1,541 USA H hudsonhornet7x pro stock
hudsonhornet7x pro stock H Joined: Jan 2012 Posts: 1,541 USA	I will assume that all rust is gone from your area. 1. Clean the surface before any grinding. 2. Prep the bare metal with 80 grit grinder discs or D.A. paper. 3. Epoxy prime the bare metal and follow the instructions on how long it should wait before you apply filler. 4. Finish bodywork and re epoxy prime to seal it all in.

Re: Prime first or filler first ??? [Re: hudsonhornet7x] #1656042 08/07/14 02:41 PM 08/07/14 02:41 PM
Joined: Jan 2003 Posts: 16,376 D dogdays I Live Here
dogdays I Live Here D Joined: Jan 2003 Posts: 16,376	Back in the day, filler went on clean metal first. The surface roughness supposedly helped the filler "grab" onto the surface. It seems that things have changed, possibly due to the advent of epoxy primer. The real answer is to use a bodywork material system and do whatever the system instructions say. R.

Re: Prime first or filler first ??? [Re: dogdays] #1656043 08/07/14 06:52 PM 08/07/14 06:52 PM
Joined: Jan 2003 Posts: 1,436 Oklahoma City OK Cudajon pro stock
Cudajon pro stock Joined: Jan 2003 Posts: 1,436 Oklahoma City OK	On a small area I like to brush on a rust encapsulator. It acts as a sealer and if you miss any rust its caught. http://www.youtube.com/watch?v=4J3K94cRC1c

Re: Prime first or filler first ??? [Re: hudsonhornet7x] #1656044 08/07/14 11:33 PM 08/07/14 11:33 PM
Joined: Jul 2007 Posts: 461 Detroit Michigan stinger mopar
stinger mopar Joined: Jul 2007 Posts: 461 Detroit Michigan	Quote: I will assume that all rust is gone from your area. 1. Clean the surface before any grinding. 2. Prep the bare metal with 80 grit grinder discs or D.A. paper. 3. Epoxy prime the bare metal and follow the instructions on how long it should wait before you apply filler. 4. Finish bodywork and re epoxy prime to seal it all in. This is the best way now.

Re: Prime first or filler first ??? [Re: stinger] #1656045 08/08/14 12:39 AM 08/08/14 12:39 AM
Joined: May 2007 Posts: 269 BC Canada 6 62440 OP enthusiast
62440 OP enthusiast 6 Joined: May 2007 Posts: 269 BC Canada	Thanks for all the replies. I went down to the local Napa auto parts store today and asked him. I mentioned that I heard different opinions on the subject and he started laughing and said that's a good way to get a argument started. I'll go with two coats etch primer and filler, two more regular primer coats and then final coats. Thanks again.

Re: Prime first or filler first ??? [Re: 62440] #1656046 08/08/14 12:57 AM 08/08/14 12:57 AM
Joined: Jan 2012 Posts: 1,541 USA H hudsonhornet7x pro stock
hudsonhornet7x pro stock H Joined: Jan 2012 Posts: 1,541 USA	Quote: Thanks for all the replies. I went down to the local Napa auto parts store today and asked him. I mentioned that I heard different opinions on the subject and he started laughing and said that's a good way to get a argument started. I'll go with two coats etch primer and filler, two more regular primer coats and then final coats. Thanks again. To each his own, but I would never put filler over etch primer. Lots of polyester fillers can have a bad reaction with the acid in etch primer. This may not show up right away but a few months down the road. Loss of adhesion, bubbling, etc. Only put filler over properly prepared bare steel or better yet over properly prepared epoxy primer. If it is a car you care about, please use a good epoxy. I am an auto body teacher and have used just about every method available. Here is what it boils down to: Collision shops: Love etch primer because it is fast and has been used forever. They are not too worried about a paint job lasting 20 years. Epoxy is too slow for the fast paced collision business even though it is a superior product. Restoration Shops: Love epoxy primer because it the best primer bar none. It takes a little while to cure but it has better adhesion, IS NOT POROUS, and filler absolutely loves to stick to curing epoxy. Spraying epoxy again over filler completely seals it in. The thing about body filler is it is like a sponge, and if you use it on bare steel there is a very good chance that it will suck some moisture and start the rust bug again. This will happen right through etch primer. Like I said, it boils down to you and what kind of job you want to do. If anyone has any questions please ask- I will be happy to answer anything I can.

Re: Prime first or filler first ??? [Re: hudsonhornet7x] #1656047 08/08/14 10:11 PM 08/08/14 10:11 PM
Joined: May 2007 Posts: 269 BC Canada 6 62440 OP enthusiast
62440 OP enthusiast 6 Joined: May 2007 Posts: 269 BC Canada	That sounds like the best way. I'll save the etch primer for something else and pick up some epoxy primer and do it right. Thanks again. Quote: Quote: Thanks for all the replies. I went down to the local Napa auto parts store today and asked him. I mentioned that I heard different opinions on the subject and he started laughing and said that's a good way to get a argument started. I'll go with two coats etch primer and filler, two more regular primer coats and then final coats. Thanks again. To each his own, but I would never put filler over etch primer. Lots of polyester fillers can have a bad reaction with the acid in etch primer. This may not show up right away but a few months down the road. Loss of adhesion, bubbling, etc. Only put filler over properly prepared bare steel or better yet over properly prepared epoxy primer. If it is a car you care about, please use a good epoxy. I am an auto body teacher and have used just about every method available. Here is what it boils down to: Collision shops: Love etch primer because it is fast and has been used forever. They are not too worried about a paint job lasting 20 years. Epoxy is too slow for the fast paced collision business even though it is a superior product. Restoration Shops: Love epoxy primer because it the best primer bar none. It takes a little while to cure but it has better adhesion, IS NOT POROUS, and filler absolutely loves to stick to curing epoxy. Spraying epoxy again over filler completely seals it in. The thing about body filler is it is like a sponge, and if you use it on bare steel there is a very good chance that it will suck some moisture and start the rust bug again. This will happen right through etch primer. Like I said, it boils down to you and what kind of job you want to do. If anyone has any questions please ask- I will be happy to answer anything I can.

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