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How is it that you can use epoxy over styrofoam but can’t use polyester, they are two different animals. If you read the ingredients in polyester build primer it will have some sort of mico balloons in it or similar to allow it to build up thicker, easier to sand but porous that is why a sealer coat is required over it and yes you can laminate to steel with epoxy, why do you think They use epoxy primers on bare metal, yes you can also use a etching primer, one bonds chemically one mechanical.
You are still dodging the question and yet you cannot seem to answer it. What credibility you feel you have is being put into jeopardy.
Seeing how this is CORVETTE PAINT and BODY FORUM....Styrofoam does not come anywhere into doing any type of repair so that example does not apply here by any stretch of the imagination. Stick with the subject matter. But seeing how you like to jump the subject matter to what suits your needs... Now I have used the designing foam when making unique parts and I lamented polyester resin right-on to of it and it did not destroy that foam. Funny how lacquer thinner can be used to get overspray off of some plastics but if you use it to clean your taillight lenses...it can eat into it badly.
Lacquer primer...polyester primer and epoxy primer will go on and adhere to steel and fiberglass if properly prepped.
YES...what is often times put in primer is TALC as a building agent....and yet to see the words. 'micro balloons' on a label; of ingredients. Is a 'micro balloons' an actual industry term. used to describe something else. I know about glass beads being in adhesives to prevent the panel from ever being clamped so hard that all of the adhesive oozes out....but that is in adhesives and not a primer.
You do things as you see fit....and best of luck with you on that and I HONESLTY hope your endeavor in getting into doing body work pays for for you. Use epoxy resin on steel as far as I am concerned and see what happens. I guess you have done it and what you did it to has lasted 10 years.
This is from the Gougeon Brothers of West system printed in 1979. It is nothing new. They use talc in bondo, ever wonder why a repair on metal with bondo rusts around it? Talc absorbs moisture there alternative fillers for thickening resin, like aerosil. Harder to sand and more brittle. But anyways, jb weld is an epoxy would you use that on metal? Do some work in the marine feild where things are more critical and you might learn some things. Epoxy is used all the time on steel vessels, so your telling me a quarter panel extension takes more abuse than a boat?
This all stems from one thing, epoxy can go over polyester, but polyester can not go over epoxy and expect to last. Call any fiberglass supply see what they say, would of been just as easy to mix some micro balloons and aersol with the epoxy resin to make a putty, West systems has all those fillers if you want to stick with same brand.
I am sure these repairs you do to boats and they have steel in them are NOT going to be painted to the level of perfection that an old classic car deserves.
SO..what you use on a boat (even though it works there) MAY NOT be the best thing to use on a classic car...because in time...your thoughts and views may come back and bite you in the backside. A straight flawless quarter panel is not the same and what you are more than likely referring to.
Also....which I do not you are aware of. Using an epoxy adhesive and allowing it to be exposed to the exterior where solvents can get to it. DO NOT be surprised if you shoot something on it and it swells.
Because JB Weld and epoxy resin are NOT they same thing by a long shot. If you eel they are the same...that is where we differ in our views. Just because they both have epoxy in them does not make them the same. Because balsa wood is not oak but yet they are both wood. And I am fully aware of the crash adhesives the industry uses and how to use them and WHERE to use them and NOT where to use them.
OK ..I see the 'micro balloons'. Never needed them...so that is why I do not worry about them SO I stand corrected because as you have shown .... they are out there. So in all of the molds I have made and Corvettes I fixed. I never needed the micro balloons.
And as for what you said is on the website. If you were referring to epoxy resin being applied to steel . I can show you where they say polyester resin can be applied on steel and that is okay also. But I have seen it not work and come right off in time.
SO...do as you wish.
Need to start a thread to continue this due to a severe act of hi-jacking this thread has occurred.
I just wanted to say after 4 years, I finally fix my drivers door, Its not perfect, but looks much better, ohh and I saved alot of money. It also looks much better in person and natural light.
I just wanted to say after 4 years, I finally fix my drivers door, Its not perfect, but looks much better, ohh and I saved alot of money. It also looks much better in person and natural light.
corvet786c .... I was wondering since I have a similar door issue if you thinks that is something I can take a stab at? never done body work , more of a backyard mechanic =)
Hi sting sorry for the delay, Yes I think you can do it your gonna need a fiberglass repair kit with resin and all, they sell it at napa, your gonna have to sand all that repair off and just follow the fiber glass instructions. I had my neighbor help me, but if you need any assistance Ill do my best to help you.
thank you Sir , now I just have to get the courage to sand that section off , its not too bad of a dent but I hate looking at it.... the paint I was going to order from topflightautomotive, with some clear coat. Thanks again
09-07-2018, 10:33 AM
