Anyone used Cromapol or Evercryl on old motorhome roof?

[Nikki]

Hi,
23 year old motorhome leaking through roof railing feet/screws, was interested to see if anyone has used the above products which are fibre based paints to repair small areas? Pros and cons
Regards Nikki

 

[SteveJ]

I've used acrypol to cover a small repair on the roof of my 21 year old motorhome. Had a freak hailstone puncture. Filled the hole with some fibreglass gel, covered with some reinforced tape and then covered with acrypol. That was 4 years ago and absolutely water tight still. I also used it to coat over some roof seams that had started to show evidence of lifting, cleaned them out, resealed and then reinforced tape and acrypol over the top. Again still solid after 4 years. I was recommended acrypol by a company that repairs motorhomes, they used it all the time for small patch repairs on older motorhomes.

 

[Nikki]

SteveJ
Thanks for replying, can I ask what reinforced tape you used?

 

[SteveJ]

The tape I used was, I think, Klober Easyform tape, primarily as that was what I had left over from a reroofing project. It isn't cheap but it is extremely good at stretching around curved shapes, and sticks like the proverbial to a blanket. If you are coating it with one of the acrylic roofing paints (Acrypol, Cromapol etc) then any decent roofing tape would be OK, or even fibreglass detail bandage/self adhesive fibreglass plasterboard tape if you are looking to simply add a degree of strength. Basically I used additional tape to simply give an additional layer over the repair just in case my repairs were not as good as I hoped.
If the item you are covering is curved then I would probably go for a decent single sided buytl tape as you can form it around curves easier. Otherwise I would use a Tyvek or reinforced acrylic tape. Good quality ones aren't cheap.
Take a look here for ideas but I would suggest then looking for the same product/type of product elsewhere as their prices may be reasonable but their delivery charges can be a bit excessive.

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https://www.roofingsuperstore.co.uk/product/dupont-tyvek-acrylic-single-sided-tape-75mm-x-25m.html

https://www.roofingsuperstore.co.uk/product/klober-permo-tr-universal-tape-60mm-x-25m.html

Klober tape:

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[Nikki]

Amazing, thanks for taking the time

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[Johnenigma]

I've used acrypol to cover a small repair on the roof of my 21 year old motorhome. Had a freak hailstone puncture. Filled the hole with some fibreglass gel, covered with some reinforced tape and then covered with acrypol. That was 4 years ago and absolutely water tight still. I also used it to coat over some roof seams that had started to show evidence of lifting, cleaned them out, resealed and then reinforced tape and acrypol over the top. Again still solid after 4 years. I was recommended acrypol by a company that repairs motorhomes, they used it all the time for small patch repairs on older motorhomes.

I am going to remove a Truma chimney which is through an aluminium roof panel. Would your suggestion work on aluminium?

 

[Nikki]

Johnenigma
I don't know if that might be too big a gap?
Maybe filling with fibreglass first.
SteveJ any thoughts?

 

[SteveJ]

If I was removing the heater vent from the roof of my MH I think I would do the following, probably a bit overengineered but I try to be a bit belt and braces:
Remove the outer cowl.
Clean the roof of all mastic etc so it is as perfectly clean as I could make it then sand down to provide a key for the outside repair.
Pull the tubing from the roof insulation.
Increase the hole diameter by a couple of CM.
Measure the hole size, depth and diameter, and make up a plug from something like Polyiso insulation board and a cap to the plug from a piece of styrene sheet or even better aluminium sheet especially if it is an aluminium roof.
Fix the cap to the underside of the roof with a good mastic, Sikaflex, everbuild stixall, PU40 etc, to give a good seal but more importantly something to work against from the outside. Prop it up to ensure a good bond whilst it dries, and then insert the insulation plug.
If I had an aluminium roof I would probably give something like Teroson Chemical Metal Repair Paste, Teroson Marine Filler or Teroson Leak Fix a try (only because I have used them many times in the past for repairs to aluminium boats and have always been impressed with them) but not sure about its adhesion to plastic so an aluminium cap inside would definitely be better.
Alternatively simply cover the hole from the outside with a suitably sized aluminium plate, stuck down with butyl tape. Personally if doing it that way I would then use something like acrypol to then cover the whole thing as belt and braces.
I am sure that their will be numerous suggestions on how to do something like this but having worked on old small boats on and off for many years I, to some degree, over engineer repairs, as a leak can have rather more serious effects then simply ending up with a damp problem on a boat.
I have repaired pin holes to thumb sized holes below the waterline with the above Teroson fillers and I know those boats are still afloat and the repairs are still solid.