LocostUSA.com

Learning how to build Lotus Seven replicas...together!
It is currently April 13, 2024, 2:21 pm

All times are UTC - 5 hours [ DST ]




Post new topic Reply to topic  [ 1315 posts ]  Go to page Previous  1 ... 84, 85, 86, 87, 88
Author Message
PostPosted: February 2, 2024, 12:30 pm 
Offline
User avatar

Joined: October 10, 2010, 10:26 am
Posts: 2037
Location: Guadalupe, CA
February 1, 2024

A minor update.. This weekend I plan to split the mold for the trunk lid, and as suggested, I've begun fabbing in a few support ribs to help the mold keep its shape.

This did not go as easily as I imagined. The plastic tubing I used had a shape memory from being packaged in a coil. I didn't think much of it as I used Gorilla tape to affix it to the mold, then no worries, just glass over it. Trouble is, the resin reacted with the tape adhesive and the plastic tube moved around a little during the cure. Not a huge deal, and I can work with it still, just an unexpected extra step to cut some of it out and do that part again. Next time I will put a heat gun to the plastic hose to straighten it out before laying glass/resin over it. Live and learn..

--ccrunner


You do not have the required permissions to view the files attached to this post.

_________________
Dean

1972 Honda N600 Restomod "ccrunner's N600 VFR800 repower"

1963 Volvo P1800 Restomod
http://locostusa.com/forums/viewtopic.php?f=36&t=16309

1959 Berkeley SE492 Restomod...
viewtopic.php?f=36&t=19397

"ccrunner's 1960 MGA coupe Restomod" found on MGExp.com


Top
 Profile  
Reply with quote  
PostPosted: February 2, 2024, 1:06 pm 
Offline
Automotive Encyclopedia
User avatar

Joined: December 22, 2006, 2:05 pm
Posts: 8041
See Nov 22, 2008 post backrest upholstered door out of polyiso foam and polyester resin direct application: viewtopic.php?f=36&t=3993&start=15

You can cut the foam with a razor then sand a little to take off the corners. Butter with the resin to stick to the sanded base, then add your layers on top. Nothing to remove and weighs practically nothing.

_________________
Miata UBJ: ES-2074R('70s maz pickup)
Ford IFS viewtopic.php?f=5&t=13225&p=134742
Simple Spring select viewtopic.php?f=5&t=11815
LxWxHt
360LA 442E: 134.5x46x15
Lotus7:115x39x7.25
Tiger Avon:114x40x13.3-12.6
Champion/Book:114x42x11
Gibbs/Haynes:122x42x14
VoDou:113x44x14
McSorley 442:122x46x14
Collins 241:127x46x12


Top
 Profile  
Reply with quote  
PostPosted: February 6, 2024, 1:41 pm 
Offline
User avatar

Joined: October 10, 2010, 10:26 am
Posts: 2037
Location: Guadalupe, CA
Feb 4, 2024

I did a little more glass work to stiffen up the mold for the trunk cover before I pulled it off of the buck.. This thing did not want to separate.. I'd fiddle with it for awhile, then go do something else, then come back to it.. After several sessions like that, it finally popped apart. The mold is a bit rough and needs some touching up before I use it to lay up the actual trunk lid.. Mold is bright white on the right side of the photo..

Does anyone here have a favorite wax or PVA mold release product that has worked well for you? I'm thinking a paste wax might be better(?).. I used both products on this part, and separation was still very challenging.. It would be nice if I can coax it to pull apart easier next time- especially knowing that it's the final part I'll be tugging on..

--ccrunner


You do not have the required permissions to view the files attached to this post.

_________________
Dean

1972 Honda N600 Restomod "ccrunner's N600 VFR800 repower"

1963 Volvo P1800 Restomod
http://locostusa.com/forums/viewtopic.php?f=36&t=16309

1959 Berkeley SE492 Restomod...
viewtopic.php?f=36&t=19397

"ccrunner's 1960 MGA coupe Restomod" found on MGExp.com


Top
 Profile  
Reply with quote  
PostPosted: February 6, 2024, 2:36 pm 
Offline
Automotive Encyclopedia
User avatar

Joined: December 22, 2006, 2:05 pm
Posts: 8041
Epoxy a 3/8 washer in a couple spots in the mold back then drill a hole. Use a rubber tip air nozzle to blow into with just a couple pounds of pressure.

Another alternative is to split the mold down the center since you appear to have a 90 degree edge all around.

_________________
Miata UBJ: ES-2074R('70s maz pickup)
Ford IFS viewtopic.php?f=5&t=13225&p=134742
Simple Spring select viewtopic.php?f=5&t=11815
LxWxHt
360LA 442E: 134.5x46x15
Lotus7:115x39x7.25
Tiger Avon:114x40x13.3-12.6
Champion/Book:114x42x11
Gibbs/Haynes:122x42x14
VoDou:113x44x14
McSorley 442:122x46x14
Collins 241:127x46x12


Top
 Profile  
Reply with quote  
PostPosted: February 6, 2024, 3:26 pm 
Offline
User avatar

Joined: July 17, 2008, 9:11 am
Posts: 6414
Location: West Chicago,IL
I'm not saying this was the right stuff, but I used an old can of Johnson's paste wax. The real old stuff, not modern car polish. A couple of coats of wax, not wiped off. The amber colored bucks were made of Styrofoam. I was experimenting with low cost methods of fiberglassing at the time. Whoever says you can't use polyester resin over styrofoam should read my posts. :roll: YMMV

Image

_________________
Chuck.

“Any suspension will work if you don’t let it.” - Colin Chapman

Visit my ongoing MGB Rustoration log: over HERE

Or my Wankel powered Locost log : over HERE

And don't forget my Cushman Truckster resto Locostusa.com/forums/viewtopic.php?f=36&t=17766


Top
 Profile  
Reply with quote  
PostPosted: February 6, 2024, 4:17 pm 
Offline
User avatar

Joined: March 19, 2011, 10:22 am
Posts: 2388
Location: Holden, Alberta, Canada
rx7locost wrote:
I used an old can of Johnson's paste wax.
That's what I use, I have a 40 year old can of Johnson's floor paste wax my late mother used to use on her kitchen floor, it's about 3/4 empty, it's worth it's weight in gold, imho. Also couple coats of pva mold release sprayed on.

_________________
Perry

'If man built it, man can fix it'
"No one ever told me I couldn't do it."
"If you can't build it safe, don't build it."

Perry's Locost Super Che7enette Build
Perry's TBird Based 5.0L Super 7 L.S.O
Perry's S10 Super 7 The 3rd
Perry's 4th Build The Topolino 500 (Little Mouse) Altered
Perry's 5th Build the Super Slant 6 Super 7
Perry's Final Build the 1929 Mercedes Gazelle


Top
 Profile  
Reply with quote  
PostPosted: February 6, 2024, 6:15 pm 
Offline
Automotive Encyclopedia
User avatar

Joined: December 22, 2006, 2:05 pm
Posts: 8041
Wax, then release agent sprayed over the top should be ideal.

Poly resin dissolves styrofoam, but a thin layer of something to isolate works fine. I used drywall mud over styrofoam but it dries far too slowly. Plaster of paris is much quicker drying. The poly-iso foam is urethane and fairly cheap and easy to sand.

_________________
Miata UBJ: ES-2074R('70s maz pickup)
Ford IFS viewtopic.php?f=5&t=13225&p=134742
Simple Spring select viewtopic.php?f=5&t=11815
LxWxHt
360LA 442E: 134.5x46x15
Lotus7:115x39x7.25
Tiger Avon:114x40x13.3-12.6
Champion/Book:114x42x11
Gibbs/Haynes:122x42x14
VoDou:113x44x14
McSorley 442:122x46x14
Collins 241:127x46x12


Top
 Profile  
Reply with quote  
PostPosted: February 6, 2024, 9:39 pm 
Offline
User avatar

Joined: July 17, 2008, 9:11 am
Posts: 6414
Location: West Chicago,IL
Miatav8,MstrASE,A&P,F wrote:
Wax, then release agent sprayed over the top should be ideal.

Poly resin dissolves styrofoam, but a thin layer of something to isolate works fine. I used drywall mud over styrofoam but it dries far too slowly. Plaster of paris is much quicker drying. The poly-iso foam is urethane and fairly cheap and easy to sand.



Old-school paper mache will stabilize the beaded-type Styrofoam before using drywall compound/plaster of Paris. The isolator I used was shellac. As you can see in my earlier photo, it worked spectacularly.

_________________
Chuck.

“Any suspension will work if you don’t let it.” - Colin Chapman

Visit my ongoing MGB Rustoration log: over HERE

Or my Wankel powered Locost log : over HERE

And don't forget my Cushman Truckster resto Locostusa.com/forums/viewtopic.php?f=36&t=17766


Top
 Profile  
Reply with quote  
PostPosted: February 7, 2024, 6:46 am 
Offline
Automotive Encyclopedia
User avatar

Joined: December 22, 2006, 2:05 pm
Posts: 8041
Thanks for the tip. I agree; it turned out great. A couple layers of shellac (first one thinned) is typically used to seal plaster bucks and molds before painting, then wax, then pva.

_________________
Miata UBJ: ES-2074R('70s maz pickup)
Ford IFS viewtopic.php?f=5&t=13225&p=134742
Simple Spring select viewtopic.php?f=5&t=11815
LxWxHt
360LA 442E: 134.5x46x15
Lotus7:115x39x7.25
Tiger Avon:114x40x13.3-12.6
Champion/Book:114x42x11
Gibbs/Haynes:122x42x14
VoDou:113x44x14
McSorley 442:122x46x14
Collins 241:127x46x12


Top
 Profile  
Reply with quote  
PostPosted: February 7, 2024, 3:45 pm 
Offline
User avatar

Joined: November 11, 2013, 4:47 am
Posts: 1622
Location: No. Nevada
Four 90º edges are always going to be stubborn with a one piece mold.
You are fortunate that none exceed 90º to form a "Draft" situation.
An air or water fitting can help a lot.

_________________
If I must be a one-man PC free zone, so be it!


Top
 Profile  
Reply with quote  
Display posts from previous:  Sort by  
Post new topic Reply to topic  [ 1315 posts ]  Go to page Previous  1 ... 84, 85, 86, 87, 88

All times are UTC - 5 hours [ DST ]


Who is online

Users browsing this forum: No registered users and 3 guests


You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot post attachments in this forum

Jump to:  
POWERED_BY