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Removing Sikaflex


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#1 all fired up

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Posted 30 June 2019 - 07:35 PM

I have unbolted some fittings on my boat. Inside the deck they were fastened through a Stainles Steel backing plate.

 

The backing plate appears to be sitting on a thin layer of a rubbery like compound something like Sikaflex. 

 

Is there a method or chemical to clean this stuff off the fibreglass?

 

Or do I have to do it the tedious way and carefully scrape it off with a sharp chisel or similar.

 

a.f.u


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#2 Maté

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Posted 30 June 2019 - 08:16 PM

It’s really hard to say what solvent will work, you have to try a few But definitely the very best method is to scrape as much as you can off before you try. Some of that citrus remover may work, acetone, Terps, xylene, it just depends good luck!
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#3 Maté

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Posted 30 June 2019 - 08:18 PM

Something else to consider is one of those caramel wheels that you put on a drill and basically erase the residue off
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#4 Maté

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Posted 30 June 2019 - 08:21 PM

Also a heat gun is very effective when scraping
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#5 Zozza

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Posted 01 July 2019 - 07:33 AM

Isn't there some sort of special wire that slices through sikaflex like butter? 
Or so I've been told.


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#6 wheels

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Posted 02 July 2019 - 05:59 AM

Cured Polyurathanes will not dissolve by anything I know of. At least anything that also would not dissolve the Boat as well.
A flat knife blade on one of those vibrating multi tools ( not what you are thinking KM ;-) ) cuts the stuff well and then it could be a case of sanding away anything left. And it is not easy to sand either.


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#7 clochmerle

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Posted 02 July 2019 - 12:32 PM

I have the answer, what you need are plastic razor blades. They are magical, you can scrape off almost anything and not damage the surface, then a scrub with citrus cleaner or meths to remove the residue.

I buy mine from aliexpress. Not sure who locally sells them.

I removed boat window sealant, and even a van roof with baked on vinyl wrap.
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