I have a question reguarding alumiprep 33. If it gets under the vinyl on the skins around rivet holes and dries is the part ruined? Does it weaken the metal?
I have been using it to etch parts before priming. I have not had any problems doing so until now. Last week I prepped my top wing skins and primed them. When I removed the vinyl strips from the rivet lines it was clear that some alumiprep 33 had seeped under the blue vinyl and dried. There were several places where the vinyl was puckered slightly allowing this. Alot actually. It had not done this before on other parts. Maybe I shouldn't do it this way or maybe I did not rinse it good enough this time. I don't know. I will do things differently from now on.
It discolored it some and left a film. Like soap scum on a shower door. I tried wiping it with acetone and mek with no luck. And I rewet it with 33 and rubbed it with a cloth with very little improvement. Then I wet it with 33 and very lightly rubbed it with a white scothbite pad and it did the best but scuffs the shine off like when I prep for primer. The aera I tested showed improvement and I feel that alittle more pressure with the white pads will take off all the residue.
So...
- will alumiprep33 weaken the sheet or will it be ok to continue after letting the etch dry.
- scuff the film off (going to paint anyhow) and continue.
- should I scrap the skins and order new ones and start over.
I've asked Van's and they weren't sure about alumiprep33 long term effects in this case. Suggested I scuff it clean and prime. And carefully watch. I just don't know and would like to know if anyone out there does.
Frank
I have been using it to etch parts before priming. I have not had any problems doing so until now. Last week I prepped my top wing skins and primed them. When I removed the vinyl strips from the rivet lines it was clear that some alumiprep 33 had seeped under the blue vinyl and dried. There were several places where the vinyl was puckered slightly allowing this. Alot actually. It had not done this before on other parts. Maybe I shouldn't do it this way or maybe I did not rinse it good enough this time. I don't know. I will do things differently from now on.
It discolored it some and left a film. Like soap scum on a shower door. I tried wiping it with acetone and mek with no luck. And I rewet it with 33 and rubbed it with a cloth with very little improvement. Then I wet it with 33 and very lightly rubbed it with a white scothbite pad and it did the best but scuffs the shine off like when I prep for primer. The aera I tested showed improvement and I feel that alittle more pressure with the white pads will take off all the residue.
So...
- will alumiprep33 weaken the sheet or will it be ok to continue after letting the etch dry.
- scuff the film off (going to paint anyhow) and continue.
- should I scrap the skins and order new ones and start over.
I've asked Van's and they weren't sure about alumiprep33 long term effects in this case. Suggested I scuff it clean and prime. And carefully watch. I just don't know and would like to know if anyone out there does.
Frank