Posted By: 62440
Prime first or filler first ??? - 08/07/14 08:52 AM
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 ?
Prime first or filler first ???
Posted By: Stanton
Re: Prime first or filler first ??? - 08/07/14 03:36 PM
It matters! Prime first.
Posted By: moper
Re: Prime first or filler first ??? - 08/07/14 06:15 PM
I use etching primer, then filler, then high build primer.
Posted By: DAYCLONA
Re: Prime first or filler first ??? - 08/07/14 06:29 PM
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
Posted By: hudsonhornet7x
Re: Prime first or filler first ??? - 08/07/14 06:32 PM
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.
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.
Posted By: dogdays
Re: Prime first or filler first ??? - 08/07/14 06:41 PM
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.
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.
Posted By: Cudajon
Re: Prime first or filler first ??? - 08/07/14 10:52 PM
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.
Posted By: stinger
Re: Prime first or filler first ??? - 08/08/14 03:33 AM
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.
Posted By: 62440
Re: Prime first or filler first ??? - 08/08/14 04:39 AM
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.
Posted By: hudsonhornet7x
Re: Prime first or filler first ??? - 08/08/14 04:57 AM
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.
Posted By: 62440
Re: Prime first or filler first ??? - 08/09/14 02:11 AM
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.