Help with primer issue!

[Jim Frisbie]

I have used a diluted phosphoric acid wash with scotch brite pads, rinse, let dry then prime.
For small parts I use Alodine 1/1 bath for 5-7 minutes
I have never had any problems with flaking.

Jim Frisbie
RV 9A 950 hrs

[eric.the.blonde]

I'm very satisfied with the results on the 6061 and select alclad items:

1) Clean d/o/g with acetone or lacquer thinner.
2) Bonderite alumniprep
3) Bonderite 5700 conversion coat, which is a non-chorme alodine I'm comfortable using at home.
4) SES self-etching primer.

Doesn't take long at all.

[wirejock]

Originally Posted by PaulvS

There should be no need to use anything as strong as acetone for degreasing kit parts. The vapours are also bad for your health.

My suggestion to prep for priming is as follows:

1) Deburr holes and smooth/round edges as per normal practice.

2) Degrease using a specific wax/silicone/grease remover, this may be naptha based. It is friendly to nitrile gloves. Use a clean cloth or paper towels, not scotch brite. Scotch brite at this stage will spread the dissolved oil and grease into the scratched surface.

3) Remove the oxidation using maroon scotch brite with water and a few drops of mild detergent. The water will sheet off when the oxide is removed. Rinse and dry the parts.

4) Within six hours (to avoid re-oxidation) wipe down the parts with methylated spirits and clean towels just before spraying the primer.

Clean gloves should be used to handle the parts through all of the above so as to avoid contamination with body oils.

Whatever primer, this is a good environmental and human griendly prep process. I tried several processes and a simple scuff with a soap works. I did find Alumiprep seemed to work better for Alodine prep. I may try that new Alodine 5700. I really hate using that other stuff.

[Southern Pete]

Originally Posted by PaulvS

There should be no need to use anything as strong as acetone for degreasing kit parts. The vapours are also bad for your health.

You should qualify that statement, I agree Acetone is an aggressive solvent. It is an eye irritant, should not be ingested and may cause drowsiness or dizziness (in my experience needs large concentrations) also repeated exposure can cause skin dryness or cracking. But it is one of the least hazardous of the solvents. Can be used in small quantities (such as the uses suggested here) with only hand protection, normal splash precautions and some ventilation.

[PaulvS]

Originally Posted by Southern Pete

You should qualify that statement, I agree Acetone is an aggressive solvent. It is an eye irritant, should not be ingested and may cause drowsiness or dizziness (in my experience needs large concentrations) also repeated exposure can cause skin dryness or cracking. But it is one of the least hazardous of the solvents. Can be used in small quantities (such as the uses suggested here) with only hand protection, normal splash precautions and some ventilation.

I agree Pete that there are more hazardous solvents, e.g. MEK, and that the hazards you've listed for acetone are as per the MSDS. When it comes to health and safety in the shop, I simply believe that it is worth minimising exposure by avoiding or choosing safer alternatives and wearing protective gear, according to the level of risk that we are personally prepared to take. If I ingested enough of any solvent to feel dizzy, I'd be concerned about the damage that's being done to my remaining brain cells!
Cheers,
Paul.

[wirejock]

Originally Posted by PaulvS

I agree Pete that there are more hazardous solvents, e.g. MEK, and that the hazards you've listed for acetone are as per the MSDS. When it comes to health and safety in the shop, I simply believe that it is worth minimising exposure by avoiding or choosing safer alternatives and wearing protective gear, according to the level of risk that we are personally prepared to take. If I ingested enough of any solvent to feel dizzy, I'd be concerned about the damage that's being done to my remaining brain cells!
Cheers,
Paul.

Walk into a nail salon sometime. Wow! Talk about fumes. Some nail polish remover is Acetone based. I wonder about the Cosmetologists working in there all day.