Hood Undercoat on the Restore - Yes? No?

General topics.

Moderators: notoptoy, S Allen, Solex68

Post Reply
User avatar
Curtis
Site Supporter
Posts: 4049
Joined: Fri Jan 01, 2010 2:49 pm
Location: Des Moines, WA
Model: 1500/1600
Year: Low Windshield-64-67.5

Hood Undercoat on the Restore - Yes? No?

Post by Curtis »

Afternoon.
My car is all primered and getting the final fit up. Original is undercoat on the trunk lid and hood. Question is do I need a coating on the hood due to heat? Have any of you left it off without problem?

Plan would be to put bed liner on it.
66 stroker, almost done.
67 basket case, paint coming soon.
eye
Roadster Fanatic
Posts: 290
Joined: Tue Nov 07, 2017 5:44 pm
Location: NC
Model: 2000
Year: High Windshield-68-70

Re: Hood Undercoat on the Restore - Yes? No?

Post by eye »

I'd paint it and, if you need to, add some stick on heat barrier or insulation later. I would not use bed liner myself. Might want to check how flammable the bed liner is too if you go that route.
projects at 329art instagram
more junk 329art.com
User avatar
Linda
Fraternal Den Mother-RIP
Posts: 7807
Joined: Sat Nov 05, 2005 11:37 pm
Location: Los Angeles
Model: 1500/1600
Year: High Windshield-68-70

Re: Hood Undercoat on the Restore - Yes? No?

Post by Linda »

Curtis
There are some car heat barrier insulation stuff that I have seen that would be lighter and still protect the hood. Sorry don’t have the names but here is one from Summit:
https://www.summitracing.com/parts/dei-050129

Linda
Sadly-Linda has passed away 2022. She was the 311's den mother and drove the first Rare-Parts ball joint project. RIP.
User avatar
Solex68
Site Supporter
Posts: 2073
Joined: Fri May 25, 2012 3:30 pm
Location: Laguna Hills, CA
Model: 2000
Year: High Windshield-68-70
Contact:

Re: Hood Undercoat on the Restore - Yes? No?

Post by Solex68 »

I would not choose that particular one as it says it's 3/4" thick.
Greg a.k.a SOLEX68 - http://www.datsunvents.com/
Laguna Hills, CA
68 2000
Always willing to help another Datsun Roadster owner
Pending installs: SS brake lines, Stan Stealth Dizzy
User avatar
Curtis
Site Supporter
Posts: 4049
Joined: Fri Jan 01, 2010 2:49 pm
Location: Des Moines, WA
Model: 1500/1600
Year: Low Windshield-64-67.5

Re: Hood Undercoat on the Restore - Yes? No?

Post by Curtis »

I found some thin one. As I think about this it seems like it wasn't there for heat but sound. They used the same undercoat everywhere. doors, bottom, fenders trunk, hood, quarter panels. I'm wondering just how much heat actually comes up from the exhaust and engine? Since the parts of the hood that aren't coated were not affected it doesn't seem like it is even necessary.
66 stroker, almost done.
67 basket case, paint coming soon.
User avatar
Linda
Fraternal Den Mother-RIP
Posts: 7807
Joined: Sat Nov 05, 2005 11:37 pm
Location: Los Angeles
Model: 1500/1600
Year: High Windshield-68-70

Re: Hood Undercoat on the Restore - Yes? No?

Post by Linda »

I think it is more about the effect of the heat on the paint on top of your hood.

Linda
Sadly-Linda has passed away 2022. She was the 311's den mother and drove the first Rare-Parts ball joint project. RIP.
User avatar
datsunrides
Roadster Fanatic-Site Supporter
Posts: 1571
Joined: Sun Apr 25, 2004 7:15 pm
Location: Roseburg, Or

Re: Hood Undercoat on the Restore - Yes? No?

Post by datsunrides »

I don’t think you need anything for heat in stock applications. On all my cars I use dynapro undercoat on the underside of the hood mainly because it hides the minor blemishes left from metalwork and I like the light texture look. It goes on pretty thin and you can topcoat it with paint so it looks somewhat factory. I would not use bed liner.
1966 Roadster
Turbo / EFI U20 (T25 w/ SDS EMU.)
User avatar
68DSU
Roadster Fanatic-Site Supporter
Posts: 1000
Joined: Thu Nov 03, 2011 10:02 am
Location: Fair Oaks, Ca.
Model: 1500/1600
Year: High Windshield-68-70

Re: Hood Undercoat on the Restore - Yes? No?

Post by 68DSU »

I put undercoating on my hood mostly add a bit of stiffening.
I'm not sure I would do it again. When I did it, it was an old car owned by teenage me. Now we are both considered classics.
Rick
Constantly working on the Datsun whenever I get around to it.

1968 SPL 311
1987 Toyota MR2 T-top (don't hate, wife's car)
2014 Ford Mustang convertible
SPF 50
User avatar
Curtis
Site Supporter
Posts: 4049
Joined: Fri Jan 01, 2010 2:49 pm
Location: Des Moines, WA
Model: 1500/1600
Year: Low Windshield-64-67.5

Re: Hood Undercoat on the Restore - Yes? No?

Post by Curtis »

I've decided to go with just paint. The original undercoat is flexible and really does nothing much that I can see to add strength. Seems to me it was there to sound deaden. One of the local roadster guys just had his car done recently and hasn't had any heat problem without it.
66 stroker, almost done.
67 basket case, paint coming soon.
Post Reply