Caravan build. Caulking compound or similar?

Submitted: Saturday, Dec 19, 2015 at 00:15
ThreadID: 131159 Views:2364 Replies:8 FollowUps:10
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Installed the floor of our van today. There are many gaps around the edges and around items like the tank filler hose, wiring loom etc that need to be blocked off to the elements.

Can anyone recommend a product (not too expensive) that I can squeeze into these gaps from under the van to close the gaps. I thought of caulking compound but have never used it. Cheers. Tony



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Reply By: Ron N - Saturday, Dec 19, 2015 at 00:47

Saturday, Dec 19, 2015 at 00:47
Eaglefree - Sikaflex make a wide range of good sealants that come in tubes suitable for the standard-size caulking guns. Bunnings carry the range.
I've found that Parchem also make a good polyurethane sealant that comes in the same standard tube, and it's less than half the cost of the Sikaflex varieties. The Parchem product is also available at Bunnings as well.

Cheers, Ron.
AnswerID: 593945

Follow Up By: eaglefree - Saturday, Dec 19, 2015 at 03:02

Saturday, Dec 19, 2015 at 03:02
thanks again Ron N. I'll give it a go.
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FollowupID: 862264

Reply By: Peter_n_Margaret - Saturday, Dec 19, 2015 at 10:00

Saturday, Dec 19, 2015 at 10:00
Sikaflex 'Pro'.
Available in 300ml tubes or cheaper in sausages. Cheaper from builders suppliers.
Available in different colours and is paintable.
DO NOT use silicone of any sort.

Cheers,
Peter
OKA196 motorhome
AnswerID: 593955

Follow Up By: Member - Mark (Tamworth NSW) - Saturday, Dec 19, 2015 at 10:03

Saturday, Dec 19, 2015 at 10:03
Peter

For my education, why not silicone?
Mark
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FollowupID: 862273

Follow Up By: Peter_n_Margaret - Saturday, Dec 19, 2015 at 12:03

Saturday, Dec 19, 2015 at 12:03
Silicone is unpaintable, almost impossible to remove and nothing else will ever stick to it.

Cheers,
Peter
OKA196 motorhome
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Follow Up By: Bob R4 - Saturday, Dec 19, 2015 at 12:19

Saturday, Dec 19, 2015 at 12:19
Not even silicone sticks to silicone!
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Follow Up By: Member - Mark (Tamworth NSW) - Saturday, Dec 19, 2015 at 19:03

Saturday, Dec 19, 2015 at 19:03
Thanks, 40 years ago when working as a roofer's labourer on large roofing & ventilator jobs we used to use mastic, hadn't heard of silicone then. 10 years later they had all switched to silicone, but then that area would never be painted and you hoped never to have to dismantle it
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Reply By: Legendts - Saturday, Dec 19, 2015 at 11:59

Saturday, Dec 19, 2015 at 11:59
Mark, any known brand of Butyl Mastic Caulking Compound will do the job. I've been there and done it! Caulking compound is better than silicone in that it does not go hard, it does skin pretty well though. It also means if you need to revisit the area you can get it off easier without the time consuming process of silicone sealers. If fitting windows or doors etc bed them in with the mastic then run a bead of silicone (I use V1 masonry silicone) around the edges to seal the mastic which keeps the mastic pliable and stops it drying out. This advice was given to me by a Geelong based caravan repairer and has worked exceptionally well for me. Hope that is of some help in your decision making. I'm not knocking Sikaflex by the way which is an excellent product, but can be expensive.
AnswerID: 593963

Reply By: Member -Hilton Hillbillies - Saturday, Dec 19, 2015 at 12:14

Saturday, Dec 19, 2015 at 12:14
G'day Tony,

Forgive my forward ness, is that your draw bar in the pic?
If so it looks a little lite, I can see that you have reinforced it but it still doesn't look right.
Maybe it's the photo.
I'm not trying to knock your work, just would hate to see you come to grief after all that hard work.
Steve

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Follow Up By: eaglefree - Saturday, Dec 19, 2015 at 14:07

Saturday, Dec 19, 2015 at 14:07
Hi Steve,

You might not have read two other threads on here in the last 2 months topic being the ultra light caravan build. Briefly the van will not exceed 220kgms as it will be towed by a VW style trike with a low towball weight (under 30 kgms)

Hence EVERYTHING in the build is lightweight. Any materials have to be limited or the projected weight wont be reached.

The drawbar is extremely strong. Ron N had advised me to add a centre strut on each drawbar as there was a weak point in the strut design. I did that and the strength of this drawbar is incredibly strong.

Thanks for your concern.

Tony
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Reply By: Member - Scrubby (VIC) - Saturday, Dec 19, 2015 at 13:14

Saturday, Dec 19, 2015 at 13:14
"SOUDAL T REX " .
This stuff is better than any other adhesive sealant that I have ever used including Sikaflex .
Available at most hardware stores but not Bunnings.
It is waterproof, paintable, sandable, drillable etc., Contains no solvents, it can be used on Polystyrene, wood, metals, plastics etc. etc.
I repaired a leaking (petrol) fuel container for the mower with it about 6 months ago, I`m still using it and it hasn`t leaked yet.
Available in White, Grey, Black.

Just my opinion,

Scrubby
I don`t know where i`m going but i`m enjoying the journey.

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AnswerID: 593967

Reply By: eaglefree - Saturday, Dec 19, 2015 at 14:11

Saturday, Dec 19, 2015 at 14:11
original thread here.

http://www.exploroz.com/Forum/Topic/131040/The_ultra_light_caravan_build_continued.aspx
AnswerID: 593970

Reply By: Member - Alastair D (NSW) - Saturday, Dec 19, 2015 at 17:17

Saturday, Dec 19, 2015 at 17:17
I agree with most of the above.

Do NOT use silicone - it will not seal long term and is a b.. to clean off.

Butyl mastic is old but good. Skins but does not harden which is good where there is movement.

Sikaflex make a butyl mastic tape which has the goo on one side and a non removable plastic tape on the other. Less messy and works well in the right situation.

Sikaflex make a good range - see their product specs for which is best suited. I have found the Marine sealant excellent in harsh conditions.

Do not use polyurethane in this application it is the wrong material.
AnswerID: 593987

Follow Up By: Peter_n_Margaret - Saturday, Dec 19, 2015 at 19:38

Saturday, Dec 19, 2015 at 19:38
I think you will find that Sikaflex is single pack polyurethane. :)
But yes, there is a significant range available.

Cheers,
Peter
OKA196 Motorhome.
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FollowupID: 862313

Follow Up By: Bob R4 - Saturday, Dec 19, 2015 at 21:14

Saturday, Dec 19, 2015 at 21:14
I believe that polyurethane has greater durability than butyl mastic (open to correction), and it sticks like 5hit to a blanket. Also has tolerance to allow expansion and contraction similar to silicone.
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FollowupID: 862316

Follow Up By: Member - Alastair D (NSW) - Sunday, Dec 20, 2015 at 06:57

Sunday, Dec 20, 2015 at 06:57
Apologies. I meant do NOT use acrylic sealants. They have poor movement tolerance.

As said many of the Sika products are polyurethane which are quite suitable for the job.
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FollowupID: 862323

Follow Up By: Slow one - Sunday, Dec 20, 2015 at 09:49

Sunday, Dec 20, 2015 at 09:49
Sika make a range of products including silicon.
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FollowupID: 862329

Reply By: swampy - Sunday, Dec 20, 2015 at 09:12

Sunday, Dec 20, 2015 at 09:12
hi
The brand Sika

Sikasil Industrial
As the name suggests silicon for the transport industry including vans and Rv
semi permanent install allowing removal . [Very very flexible not rigid like gutter silicon ]

Sikaflex urethane
For permanent installs of trim etc and depending upon specification can be used structurally .

Butyl mastic has a shorter life span than both of above and does dry out . At this point it does not seal . When 5 years and older if exposed can leave nice black stains on a white van. Very cheap .

My 05 jayco uses silicon on the wiring penetrations in the floor . Urethane for some roof trim .Butyl mastic on all the exterior fittings .All the butyl has been removed for sikasil industrial .

swampy
AnswerID: 594002

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