Filler over epoxy - best practice question

E

Evil_Fiz

Promoted Users
Assuming there is a difference, for best adhesion and durability which of the following processes is the best to follow?

Option 1:
Apply 2 -3 coats of epoxy over bare metal -> Apply filler over epoxy within the 7-day window

Option 2:
Apply 2 coats of epoxy over bare metal by brush or roller in sections -> Sand epoxy with 180# -> Spray 2 -3 additional coats over sanded epoxy -> Apply filler within 7-day window

If there is a difference, is it significant, worth considering, or negligible?

Cheers,
Emil
 
Chris_Hamilton said:
Option 1 is what all of us do. With your option 2 there is no additional benefit to what you described.
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Let me rephrase:
Will option 2 hurt me in the long run? Option 1 is more difficult for me to achieve at this time, but it is doable if needed.

Thanks
 
Evil_Fiz said:
Let me rephrase:
Will option 2 hurt me in the long run? Option 1 is more difficult for me to achieve at this time, but it is doable if needed.

Thanks
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Why would it be more difficult? After recoating you are back at the beginning anyways. If you can't get it all on/done within the window then yes you would sand and reapply epoxy which would re-start the window.

I took your question to mean that you were asking if one was better than the other.
MJM said:
Option 1 didn't state how the epoxy is to be applied?
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I don't get what you mean. He said apply 2 or 3 coats. I would assume he meant spraying it.
 
Chris_Hamilton said:
I took your question to mean that you were asking if one was better than the other.
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Yes, that was the gist of my original question.
I have to reapply Ospho and neutralize it. I want to do it in sections and apply epoxy soon after to mitigate rust occurrence due to the rinsing process and FL humidity. Setting up my spray area is cumbersome, hence the bush/roller application in sections rather than spraying all at once.

I am still unclear if end-to-end chemical bond (option 1) is superior to a mechanical then chemical bond between epoxy coats and a chemical bond between epoxy and filler (Option 2). If both options are equal, option 2 is a better fit in my circumstances.

-----
Emil
 
Either option is fine. For option 2 you’d only need to spray 1 coat when you’re ready.
 
Evil_Fiz said:
Yes, that was the gist of my original question.
I have to reapply Ospho and neutralize it. I want to do it in sections and apply epoxy soon after to mitigate rust occurrence due to the rinsing process and FL humidity. Setting up my spray area is cumbersome, hence the bush/roller application in sections rather than spraying all at once.

I am still unclear if end-to-end chemical bond (option 1) is superior to a mechanical then chemical bond between epoxy coats and a chemical bond between epoxy and filler (Option 2). If both options are equal, option 2 is a better fit in my circumstances.

-----
Emil
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Chemical bond is far superior to the mechanical bond. The mechanical bond would only help adhesion if the epoxy was out of the window. Rest assured the chemical bond is all you need.

Spray two coats, wait a min of 24 hours, then apply your filler. If you can't get all your filler work done in the window, when you are ready, lightly sand with 180, re-apply 1-2 coats of epoxy and then the window is reset. Wait 24 hours and start you filler work again. No need to overthink it.
 
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