Jonmalibuss Posted March 12, 2005 Report Share Posted March 12, 2005 First thin layer of fiberglass in vaccum bag Final mold just needs some touch up then ready for laying carbon fiber and vaccum bag Link to comment Share on other sites More sharing options...
stexx Posted March 12, 2005 Report Share Posted March 12, 2005 good work i like make me one Link to comment Share on other sites More sharing options...
6.0ss Posted March 13, 2005 Report Share Posted March 13, 2005 fiberglass is fun!!!! Carbonfiber is even better!!! Link to comment Share on other sites More sharing options...
Jonmalibuss Posted March 13, 2005 Author Report Share Posted March 13, 2005 Well some bad news on this project! Just as I was refinishing the mold to fix some very minor blemishes with resin and stuck the cover back in the mold to revaccum bag it the power went our here in my neighborhood for about 3hrs. or so. So not being able to get the vaccum going and having layed the resin already the mold is now screwed! Link to comment Share on other sites More sharing options...
cokedrvrbjw Posted March 13, 2005 Report Share Posted March 13, 2005 what is the vacuum bag used for? Link to comment Share on other sites More sharing options...
2003SilvSS Posted March 13, 2005 Report Share Posted March 13, 2005 When working with molds, you have to have some source of pressure for the resin/plastic to fill the small intricates of the mold. The vacuum bag pulls all of the air out of the mold and forms to that shape. If you remove all air and use the natural pressure at your elevation it can equal alot of pounds per square inch. I forget the exact terminologs, but if the mold has a surface area of say 2 feet and the natural air pressure is 14 PSI at 30# of vaccum, then the total weight on that mold would equal 14*144*2 = 4032 lbs I work in plastic extrusion, but I did take a composite class when I was in school and watched this done a few times. Brian Link to comment Share on other sites More sharing options...
cokedrvrbjw Posted March 13, 2005 Report Share Posted March 13, 2005 how do you get the mold out?? Should it just pop off? Link to comment Share on other sites More sharing options...
d_a_n_payne Posted March 14, 2005 Report Share Posted March 14, 2005 How much weight will it take off the truck Link to comment Share on other sites More sharing options...
Jonmalibuss Posted March 14, 2005 Author Report Share Posted March 14, 2005 how do you get the mold out?? Should it just pop off? <{POST_SNAPBACK}> Mold release it's a water based liquid that when it dries creates a plastic film. I applied it to the engine cover let it dry and then startd with the fiberglass then into the vaccum bag. You can see the mould release in the second pic on the original engine cover piece. Link to comment Share on other sites More sharing options...
cokedrvrbjw Posted March 14, 2005 Report Share Posted March 14, 2005 are you trying it again? Link to comment Share on other sites More sharing options...
Jonmalibuss Posted March 14, 2005 Author Report Share Posted March 14, 2005 are you trying it again? <{POST_SNAPBACK}> Yeah I think i'll try it again but might need to block off the streets in & out of the neighborhood so no dumba$$'s run into the power box and tear out the power for 3+hrs. Link to comment Share on other sites More sharing options...
Xero Posted March 15, 2005 Report Share Posted March 15, 2005 i need a new engine cover wanna make me on too there buddy? Link to comment Share on other sites More sharing options...
vette dude Posted March 15, 2005 Report Share Posted March 15, 2005 what are u using for vacum and bags john? I wish my fender mold had turned out that nice... Link to comment Share on other sites More sharing options...
Jonmalibuss Posted March 15, 2005 Author Report Share Posted March 15, 2005 what are u using for vacum and bags john? I wish my fender mold had turned out that nice... <{POST_SNAPBACK}> Vaccum is just a 3hp. shop vac the guy at work helping me with Ideas told me it might burn it up but I left it on pulling vac. on the bag for 30+ min. and it never got hotter than normal use. and the bag I had in the pic was a pretty thick plastic, thicker then your normal trash bag the next time I vac. bagged it for the next layers I just used trash bags seemed to work fine! Link to comment Share on other sites More sharing options...
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