Craig Hopkins gives a review of his preferred weld through primer – Medallions rubberseal RS512. He claims this is the best weld through primer he has ever used despite what others say. See how to apply a thin coat to the bottom of the panel.
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I have tried Eastwood and SEM weld thru primers. All instructions say to apply primer and then grind to bare metal where the welds are to be. I’ve tried to weld thru these weld thru primers and it doesn’t work. Is Medallion that much better or is something being left out? What changes need to be made to welder settings?
Hello Simshome4u,
Please let us know if you have any further questions:
When it comes to the use of Weld-Thru primers… you either love them or hate them.
I know many professional welders and or car restorers on both sides of the fence.
I personally do not recommend them for TIG welding as the process tends to “cook” the weld area and the primer becomes an impurity in the weld.
The whole concept of weld thru primers is to weld thru them and I have not read instructions that indicate grinding away the primer in the weld areas.
I believe some welders put it on too thick making it hard to maintain a good arc, and in some plug welding situations grinding away the primer in spots can improve the weldability.
typically a little more heat is used when using weld-thru primers with a MIG welder, but this is often the only difference.
For myself I only use weld thru in areas I will have a hard time getting to the backside once the project is complete, otherwise If I can get to both sides of the panel to seam seal and epoxy prime that is my preferred path.
Sincerely,
Sarah
Classic Car Restoration Club Video Membership
I can’t find the Medallion Rubber seal 512 anywhere do you know where to purchase it from
Hello Virgil!
We’d be happy to answer this for you. But our “ask the expert” program is currently for membership only. If you are interested in renewing your membership, please use the following l-ink and choose “Returning Customer” so you can log in. –
If you have further questions, please reach out via chat on our site or by calling 1-855-706-3534.
Sincerely,
Julia
Classic Car Restoration Club Video Membership
No video
Hello Martin,
I am sorry that you are not able to access the video. I have tested the video successfully. I would suggest clearing out your cache/internet history or try viewing on a different browser.
Thanks,
Becky
Classic Car Restoration Club Video Membership
Rubber seal products have been the best products ever. I’ve been using their primer and cleats for over twenty yrs now!!