need some help here for molding

[fiberglass jack]

take it ur going to paint the part, do u have a part that u want to make. if so then you will have to make a multi part mould, got a photo or drawing?

[spyder3000gtvr4]

well im going to be, i am doing a lip on a car but i read the post about the male/female mold the one that shows the car you made. but i will be doing a spoiler soon and would lilke to know the best way. did you make the mold from scratch for that car? if so how!?!?! i have been making a new front bumper and its been hell and taking forever

[fiberglass jack]

fisrt forget making a mould what u have o do is make a plug which is a modle of the part u are making, after u make this plug you will make a mould off it,so how to make a plug u could take a excesting spoiler and do some changes u want , or with wood and bondo after u do this u can make a mould,nowadays cnc routiers do the work using mdf or foam but its fun doing it oldschool

[spyder3000gtvr4]

ok i understand molding the outside but how does it leave the inside hollow? is it a male female mold then bond the 2 pieces together?

[spyder3000gtvr4]

oh im sorry i reread your post i think i understand now. yeah that makes sense thanks

[spyder3000gtvr4]

no kinda lost still how would you make the side supports for this spoiler? i have this spoiler and its hollow inside how did they do that.
the second ppicture is much larger

[fiberglass jack]

the air intake holea are cut out after the part is made, the mould u will have is a female

[spyder3000gtvr4]

what air intake holes? so for the side pieces of the spoiler its a female mold i guess its like 2 pieces and then there bonded together?

[colkrtz]

I am trying to build a live well in the front area of my jet boat, it is fiberglass so i will be using the floor and sides and just need to add on a back and top, i can buy store bought hatches for the top or make them too. Please help, dont know where to start, how do i make the back panel, do i make it all out of fiberglass or cut a board to shape and fiberglass it, etc...

[apprentice]

we gelcoat diffrently down here we first apply gelcoat usually in 3 layers with a polypot let it set than wet out our choped strand and place it on the mould followed by however many other reinforcements rolling out all air between layers as this makes the final rolling out procedure ahell of a lot eiser. as for the second question i have no idea