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04-07-2021, 09:46 PM | #1 | |
Registered User
Join Date: May 2013
Location: You're the only 10 I see
Posts: 367
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Re: Roof patch causing warp / oil canning
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Do you have any comments to my sketches above with the backer? My core concern is a small backer strip leaves little surface area for the original roof skin and the patch to all mate together. Do these strips need to be wider? Should I space it down to allow more room for the bond material to fill the void and not squeeze out?
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04-07-2021, 10:39 PM | #2 | |||||
Registered User
Join Date: Jan 2013
Location: Leonardtown, MD
Posts: 1,636
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Re: Roof patch causing warp / oil canning
First I'd like to say thanks for all the kind words, but I fear you guys overestimate my skills or abilities. I've had quite a bit of metal thrown into the scrap pile, serving as quite the lesson of what not to do. Have also had to strip down a paint job due to overeager application of Ospho by the owner into pitted areas, and me spraying epoxy primer directly over top of it (having no prior experience with Ospho). Sunlight over the course of the first year of car shows reactivated the deposited acid in the pits where it was now outgassing and we had small 1/8 and smaller circles where the epoxy was delaminating above these pits. ..
But I am a rather fast learner, and tend to offer opinions to help others capitalize on my learning curve. So when people start singing praises of using Ospho and other such snake oils, I am quick to offer my insight. Many of the proponents of these products simply are amazed by the minimal amount of work needed (ie: shortcuts) and have recommended product based on this and not much else, as most were still sitting in bare metal in project stage.. Lorne, this is what really get my blood pressure going .. People giving half ass recommendations that haven't finished the job to know the full story yet. Hey, I get it. We humans are lazy, and looking for an easier way, so that's why so many of these short cut products are sold. But that, folks, is why Robert is so damned opinionated.. Quote:
Here's the answer from the horse's mouth. Yes, I asked him to clarify once before and this was his response. Names changed to protect the innocent/unknowing. He also spoke of his experience with adhesives, and I am leaving that as well, perhaps you can speak to that based on your experiences.... Quote:
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Lorne, thanks for adding your experiences here with the adhesives, I agree fully that sometimes another method may be in order, and that is the decision the owner must make in each circumstance. Sometimes you get people that don't want to share with others what didn't work as they don't want to admit "failure", or whatever the reason. I see those as a learning moment, and would feel remiss if I didn't share, especially given the costs today of paint and supplies. Quote:
I do not have personal experience (disclaimer) but what I have read is that any seam should be clamped tightly. I would interpret that as meaning the joint may be stronger as a thin film between the two panels, and not used as a "filler". It may be, based on the roof repair on the 34 Chevy written above, that too much of a gap and the adhesive does it's own shrinking which pulls the area downward.. My thoughts are that the spacer is going to weaken the joint. Perhaps Lorne can share his thoughts on this as well.. .
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Robert Last edited by MP&C; 04-08-2021 at 08:01 AM. |
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