Mark Phillips in TN
Joined: 10 Jan 2006
Posts: 431
Location: Columbia, TN
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 Posted: Tue Jul 04, 2006 4:31 am Post subject: Marhyde reformulation? |
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Howdy folks-
Have any of you other Marhyde #5111 (spray) or #5112 (quart) users out there seen a change in this stuff's quality over the last year or so? A buddy building a Mustang II has been using it and it does not seem to stick to properly-prepped aluminum anywhere near as well as when I used it to build my plane. You can scratch it off the surface with a thumbnail pretty easily. It was tough stuff on my project and about the only way I could get it off was to sand it off! See:
http://websites.expercraft.com/n51pw/index.php?q=log_entry&log_id=4863
I sent an inquiry to Bondo Corp's Tech assistance several weeks ago and the respondent asked for batch #s which were forwarded. I haven't heard back yet. He claimed there has been no change in formulation. If so, their QC has some serious problems, but I really think they've changed it (even smells a little different). Although my own experience with it was excellent, I need a substitue immediately. Discussion over the years on the RV-list points to other self-etch primers, namely SW GPB988, SEM 39683 and Dupont A-4115S, which I believe is also the same as NAPA 7020. If you are presently using one of these and are satisfied they bond well to aluminum, please let me know!
I most respectfully ask that you PLEASE do not respond to this message with your concerns & opinions about using self-etch primers (unless you have specific FACTS about new EPA regulations or some other factor that has castrated ALL of these products!) If you want to do that, contact me OFF LIST and spare thousands of listers the annoyance of wearing out their DEL key. I have been on this list for many years and have heard it ALL about etch/alodine/epoxy/wash primer/whatever and am looking for hard information regarding the current crop of self-etch primers specifically. The last thing we have time for is an argument over primers- it's already archived, again&again&again&again..........
Thanks!
Mark Phillips
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