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- Thread starter coby74
- Start date

Thanks Barry, but I think I'm missing something I thought reduce epoxy had to be applied over 320 or finer grit?You can reduce the epoxy to 1.1.25 max

Sand the old with 180.

1.1.25 should cover in one coat. If not, do two coats.

He’s referring to 12.5% or less reduced epoxy, the 320 grit rule is for 50% reduced afaik.Thanks Barry, but I think I'm missing something I thought reduce epoxy had to be applied over 320 or finer grit?

Don

Well I’ll take your word for it. I read it 1 1 .25 so a 12.5% reduction.

Same as 1 1 1 is a 50% reduction. Or at least I thought it was . Now you have me doubting myself….

Don

Last edited:

50% reduction is 1:1:1. Reduction is based on the sum of the previous 2 parts.

Since epoxy mixes 1:1 with hardener, the .25 is the amount of reducer as Chris stated. Otherwise you would be mixing it 1 part epoxy with 1.25 parts of hardener.Well I’ll take your word for it. I read it 1 1 .25 so a 12.5% reduction.

Same as 1 1 1 is a 50% reduction. Or at least I thought it was . Now you have me doubting myself….

Don

Understood. Just assumed it was the volume of reducer, not the percentage reduction. It’s really unclear to me at least. I know the rest of you are a helluva lot smarter than me. Hopefully @Barry can clarify….Since epoxy mixes 1:1 with hardener, the .25 is the amount of reducer as Chris stated. Otherwise you would be mixing it 1 part epoxy with 1.25 parts of hardener.

Don

Know of a "mol" measuring stick I can get somewhere?This is why we just express everything in mols.

Never mind, way over my pay grade.

Mixing ratios always begin with the product you are applying, followed by the recommend amount of hardener, activator or reducer as stated on the product can.

1:1 - in this case it is an equal amount of each. Example 1 gallon of base coat plus 1 gallon of reducer. 100%

2:1 - Here we see that you put twice as much product as you do additive. Hence 2 gallons of base coat to 1 gallon of reducer. 50%

4:1 - Now we are at 4 times the product to the additive. Hence 4 gallons of base coat to 1 gallon of reducer. 25%

When dealing with 2k (two component) products, you will have the amount of product first and the activator/hardener second.

Example: Build Primer may be 4:1 which means 1gallon of product plus 1 quart of activator.

If reducer is also needed the ratio of reducer will be in relation to the total volume of the mixed product. Again using the Build Primer as an example: 4:1:1

Which would be 1 gallon of primer plus 1 quart of activator mixed is 5 quarts (160 ounces) to which you would add 1 quart of reducer thus giving you a 20% reduction.

When dealing with Epoxy Primer you have equal amounts of Product and Hardener hence 1:1. If the amount of reducer is given as 1:1:1 your reduction is 50%. 1:1:.5 would = 25% 1:1:.25 would be 12.5%

Which is exactly what I said, 12.5% and iI was called out for it and told it is 25%. . Hopefullly Barry will clarify since it was a little confusing the way he stuck in all those decimal points…

Mixing ratios always begin with the product you are applying, followed by the recommend amount of hardener, activator or reducer as stated on the product can.

1:1 - in this case it is an equal amount of each. Example 1 gallon of base coat plus 1 gallon of reducer. 100%

2:1 - Here we see that you put twice as much product as you do additive. Hence 2 gallons of base coat to 1 gallon of reducer. 50%

4:1 - Now we are at 4 times the product to the additive. Hence 4 gallons of base coat to 1 gallon of reducer. 25%

When dealing with 2k (two component) products, you will have the amount of product first and the activator/hardener second.

Example: Build Primer may be 4:1 which means 1gallon of product plus 1 quart of activator.

If reducer is also needed the ratio of reducer will be in relation to the total volume of the mixed product. Again using the Build Primer as an example: 4:1:1

Which would be 1 gallon of primer plus 1 quart of activator mixed is 5 quarts (160 ounces) to which you would add 1 quart of reducer thus giving you a 20% reduction.

When dealing with Epoxy Primer you have equal amounts of Product and Hardener hence 1:1. If the amount of reducer is given as 1:1:1 your reduction is 50%. 1:1:.5 would = 25% 1:1:.25 would be 12.5%

I believe the idea is to get a chemical bond between the epoxy sealer coat and the base. Not sure about all that, but I have done the above and never had any issues as long as I was in the recoat window.

Hopefully, Barry or one of the pros will verify this.