Summary for chem film rework Discussion
Chem film rework is the focus here: Ethan Oliveira asks how to improve touch-up coating on aluminum parts with Type 1 Class 3 chem film after scratches are removed with red Scotch-Brite, cleaned with alcohol, prepped with BONDERITE C-IC 33 AERO (Turco Alumiprep 33), and then brushed or pen-applied using BONDERITE M-CR 600 RTU AERO or BONDERITE M-CR 1132 AERO. He notes that a heat gun has sometimes helped the coating adhere, but the rework remains difficult to control. The only answer in the thread, from an unnamed responder, does not give a new process or product recommendation; instead, it directs Ethan to thread 108/93, “No Rinse Alodine 1132 Touch Up Pen Q&A's, Problems & Solutions,” implying that the relevant guidance is already covered there. No conflicting advice appears in this excerpt.
Q. Hello all looking for some guidance,
right now we have a considerable amount of chem film rework that we can not get a hold of. We are using aluminum parts and need to do touch up work using Type 1 class 3 chem film. We have BONDERITE M-CR 600 RTU AERO (FORMERLY: ALODINE 600 RTU and BONDERITE M-CR 1132 AERO (FORMERLY: ALODINE 1132 TOUCH-N-PREP PEN). Our process looks like this, typically if an area has a scratch through chemfilm we remove the scratches with red scotchbrite then clean the area using alcohol. We then proceed to use BONDERITE C-IC 33 AERO (known as TURCO ALUMIPREP 33) to prep the area for chem film touchup. Then we brush the chemfilm on or use touch up pen to disperse chem film coating. In past we have used a heat-gun while applying as it has helped sometimes with the coating to adhere to part. We are looking for any products or technique needed to help these parts get coated properly. Any help is appreciated.
ethan oliveria
Manufacturing Process Engineer – north andover
September 18, 2025
A. Hi Ethan.
If you have not yet done so, please see thread 108/93, “No Rinse Alodine 1132 Touch Up Pen Q&A’s, Problems & Solutions”
Luck & Regards,
Ted Mooney, P.E. RET
Striving to live Aloha
finishing.com – Pine Beach, New Jersey
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