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Subject Topic: Mastic on a roll Sikaflex or Seamseal?
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Message posted by MrAB on 21/9/2006 at 8:56am
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I have decided to reseal all my rails but wondering what you all reccomend.

I will go with the majority vote.

I think its going to be mastic on a roll but would still like to know all the pro's and cons.

Pros and Cons I have already read about?

1) Mastic on a roll is only good for a few years, is this true?

2) Seamseal will last longer but is more difficult to apply.


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Message posted by batt on 21/9/2006 at 9:08am
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I am in the windscreen trade and we use silaflex all the time .Are you sure silkaflex is made for what you want it for???

I now it works on glass but plastic unsure!!

Just check cause we see so many bodge jobs in my trade that once done ,makes our job harder.

For instance people try to seal screens with silicone,which actually braeks down the polyureathane that the screen is stuck in with!!!!!

 

We also use a Butyle tape on a roll which is good for all types of things till it getts relly hot in the summer then it can melt!!!!

So my advice is check you are 100% using the right materials .

sorry if you are aware already about this but it may help someone else.

Cheers

BAT


Message posted by MrAB on 21/9/2006 at 9:19am
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Any advice is greatly appreciated, I am new to this and want to get it right first time.

 


Message posted by cazanne on 21/9/2006 at 11:19am
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hi we have no long just done ours we used mastic on a roll

cazanne


Message posted by U-F-C on 21/9/2006 at 11:38am
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Quote: Originally posted by batt on 21/9/2006

For instance people try to seal screens with silicone,which actually braeks down the polyureathane that the screen is stuck in with!!!!!


Two weeks ago we had our windscreen replaced at National Windscreens, when they removed the old windscreen they noticed rust around the frame so advised me when i went to collect the car to USE a silicone sealant ontop of the rubber fitting if i wanted just to make sure no leaks got in past the rusted spots. Is'nt it funny how two people making a living in the same business give completely different conflicting advice.

But in regard to the Sikaflex, It is a purpose-designed adhesive and sealant for caravans, motorhomes and trailers. - See Here for information on the product and other's similar.

Re: mastic-on-a-roll, it has a life expectancy of a minimum 10 years, so no it does'nt last forever, but will you be keeping your van for more than 10 years?

Weighing up the pro's and cons, ie: speed and ease of fitting, no mess, price etc. it has to be the roll of mastic for me anytime.



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Message posted by MrAB on 21/9/2006 at 11:50am
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Thanks grub for your reply

I read through some old posts, and notice you went through a lot of sealants when you started your projects and had lots of problems. I couldn't find which method you finally settled for, I guess its mastic on a roll.


Message posted by alsparker on 21/9/2006 at 11:55am
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HI Mr AB

I have used all three of these items and here in my honest opinion are my findings 

Seamseal   not recommended

I bought three tubes of it to do my renovation and still have all three after trying it out . I found that  seamseal is useless on most jobs as it is very messy. when its fitted into position and the rail is back in place  it always seeps over the edge of the rail, if touched or leaned on by someone it takes the consistency and habit of chewing gum, it gets everywhere. 

W 4 Mastic on a roll  Highly recommend

This I used on the main seals and all over the caravan, I found it easy to apply and very forgiving when refitting the long corner rails to the sides and roof of the caravan. the life span of this product is said to be short yet the mastic taken off my caravan was around 20 years old . to see tips on using this look at my caravan renovation pages found on my website

sikaflex 512   very good

I have used this product for quick sealing jobs and found it works well. I have been told that it is tis product that is used on modern day caravans and most repair shops use it too.  I found it very good but very unforgiving as the moment the rail touches the body it stick into position so more care is needed in positioning the rails when refitting.

More information and prices of all three products and a few more can be seen here  the link comes up with an error page but just click product overview and it will take you too the seal page.

hope this helps


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Message posted by U-F-C on 21/9/2006 at 12:23pm
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Quote: Originally posted by MrAB on 21/9/2006
Thanks grub for your reply

I read through some old posts, and notice you went through a lot of sealants when you started your projects and had lots of problems. I couldn't find which method you finally settled for, I guess its mastic on a roll.


You are not wrong my friend, when i started the damp repair project i was given a lot of conflicting advice, i was told to use 'hard as nails' and regular white or clear silicone based sealants for all the rails etc, but i later found these to be a waste of time and money (and a bugger to remove!).....home bathrooms and kitchen sealing - ideal....caravans definitely not! - but we live and learn.

I was advised to use mastic-on-a-roll from members of the fixed-it club which was excellent advice as i now have no problems whatsoever!

A lot of people think that they can fix leaks by simply going over the rails with a clear silicone sealant, but they find out the hard way that this is a waste of time and effort.

all the best.



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Message posted by alsparker on 21/9/2006 at 1:11pm
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well said grub

Message posted by batt on 21/9/2006 at 1:40pm
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"Two weeks ago we had our windscreen replaced at National Windscreens, when they removed the old windscreen they noticed rust around the frame so advised me when i went to collect the car to USE a silicone sealant ontop of the rubber fitting if i wanted just to make sure no leaks got in past the rusted spots. Is'nt it funny how two people making a living in the same business give completely different conflicting advice. "

GRUB

I am a employee for the RAC for over 10 years and manager for 4 years ,I would be amazedand very concerned if National windscreens are using silicone for sticking windows or in fact mouldings to a road going vechicle.

The ureathane we use is in a tube similar to silicone so i can see were your confusion has come from.The only Cure for rust is to have it repaired PROPERLY>

By the way what car is it.

Do not use silicone as it is not made for cars!!!!!!! normally bathrooms ets!


Message posted by U-F-C on 21/9/2006 at 1:59pm
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Hi Batt,

I never said National Windscreens were using it in their work, i said that due to the frame of my windscreen being rusty (and letting in water in the past) they said that if i wanted i could apply a layer of silicone sealant on top of the rubber fitting to make sure no leaks got in in the future, as although they fitted the windscreen to the best of their ability they could not be 100% sure that i would not get leaks in the rusted areas in the future, and a bead of silicone all along the rubber fitting may stop this. I'm not saying what they said was right and you are wrong or visa versa, i'm just saying that two experienced people in the same line of work have different opinions and give different advice, which is nothing new and happens in every line of work.

all the best.



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Message posted by batt on 21/9/2006 at 2:17pm
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what car was it??

Message posted by U-F-C on 21/9/2006 at 3:15pm
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It's a Volvo 2 series.

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Message posted by batt on 21/9/2006 at 3:31pm
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Now we get diffrent!!

The car in question had a screen orginally (factory) fitted with  Buytyl tape,(a sticky non harding type mastick)When they are refitted they are Bonded back in.(with polyureathane)This is a better more secure way of fitting them.

If the screen leaks putting silicone wont work,you would need the screen out and refitting once the rust has been treated.They should have given you this option fist  or at least called you.

Hope this helps Any more window queries will be glad to try to help!!

I


Message posted by U-F-C on 21/9/2006 at 3:55pm
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Thanks Batt,

I have left a question in the General Outdoor Section that i'm hoping you could help with to save hijacking this thread anymore than we already have.

Cheers.



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Message posted by alsparker on 21/9/2006 at 4:01pm
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thats what threads are for  Grub hehe

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