TUTORIAL: how to make a cardboard mold for fiberglass

TUTORIAL: how to make a cardboard mold for fiberglass


This is how the mold is expected to be. The templates are glued with glue stick… …and cut with utility knife. The three parts of the base are spaced with segments of cardboard pipe, joined with instant adhesive. A slight cut in the lines where the piece will be bended. One layer of Con-Tact, to make it impermeable. Preparing the release agent (a mixture of alcohol and PVA). Apply a good and uniform layer. Preparing the resin. The first layer of fiberglass is “cloth”. Applying the resin. Remove air that forms bubbles. Next layer of fiberglass is “mat”. And one more layer of “mat”. Before the material gets completely “cured”, the unwanted edges can be cut with utility knife. (TAKE CARE! Protect your body.) This membrane is the release agent (PVA).

44 thoughts on “TUTORIAL: how to make a cardboard mold for fiberglass

  1. hello dickel so nice work it is so funny because i do exactly like you i use google sketchup for design after i print on paper and i stick on cardboard
    but after i don't use fiberglass but i use newpaper and with water and woodstick
    but i don t understand what is the water in green bottle
    how you do for fiberglass don't stick
    why you do a transparent plastique?
    thank you for this video nice tutial

  2. I need to learn how to do a cheap easy mold. Your cardboard idea looks good. I sure wish you would have explained what you were doing , what your are mixing and why. If I want to hear music I could turn on a radio. I really hate to grip about this but I see so many good how to do thing messed up my the creators playing music instead of teaching.

  3. I'm going to design some outriggers for a windsurfmaran and I think instead of foam (which is better) I'm going to try, if only for curiosity's sake, using cardboard molds. I think I will wrap the cardboard in plastic though, to ensure epoxy does not soak into the board. I don't see why the cloth cares what material the mold is made of..

    Also, I notice you use the chopped strand mat to fill in between the cloth. Is that the common practice to get some thickness but at a cheaper cost than cloth alone? Last question, do you cut the edges before or after it is fully cured? Thanks!

  4. This is not a "Tutorial"', tutorials stands for an explanation of how to accomplish something, you need at less words explaining what you are doing and at most an explanation of how to do it, music wont do it. This is more of a "Demo" then a "Tutorial".

    Has a side note, i rather just have normal sound then music.

  5. should always cut away from yourself with a utility knife, especially if you are cutting that close to your stomach.

  6. Well, you didn't show how to make moulds that were any use! Congrats, you're now the proud owner of a… um… er… um… useless bit of fibreglass! That, or the shortest bit of guttering known to mankind.

  7. Thank you for the great video, aside from the fact that people are nitpicking the "Demo" vs "Tutorial", good grief get a life people. It was very clear, even to a complete novice like myself, on how to create a mold and lay fiberglass. Thank you.

  8. Can I throw something out there? If you would like your part to be colored, instead of painting afterwards you can whichever color paint in the mix, I used black I just asked the guy at the paint store so I am not sure exactly what sorta paint it is but yall can figure that out. Great vid I am so fed up with people talking on youtube!

  9. Nice Job, But, for a part that size, you don't need to use the Polyester resin and take it outside cuz it stinks up the house.. You can use " Polycrylic " .. It's water based, cleans up with water, no smell at all, and it's almost just as strong.. You can buy Polycrylic at Home Depot or any home improvement store.. It comes in small sizes for small Jobs.. Plus You can mix regular Acrylic paint in it and have any solid color, or just drip the paint in and make swirl flow colors, etc.. Acrylic Paint is found at any hobby and craft store. less that $1.

  10. Awesome video! I've been looking for something like this to create my own moulds. You made it so simple. Thank you

  11. please excuse my ignorance, but i am very new at this. what is the name of the contact paper you used and what is the compound you used to spray on your project?

  12. Take that fiberglass part fair one side gel coat and reinforce it and you have a mold. Then that cardboard mold was essentially the plug, Cool vid…

  13. Hi! I loved the video!, I was wondering if you can give me some advice if you see this comment :).
    I made a 6'0 cardboard sculpture of a lego man and I want to cover it completely in fiberglass but keeping the actual cardboard under it.
    Is that possible? thanks in advance! any help is appreciated!

  14. Why did I dislike your video? Its not informative at all. Maybe for 8 years old kids but you would need to afd some colours and kids music

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