Surface preparation - is a “bog” good enough for patching concrete?
You strive for the best flooring system possible, so why perform concrete repair with any old “bog”?
Perhaps “bog” is a slang term from my part of the world, but generally speaking it’s a cheap patching compound used to
fill cracks and voids before over-coating. The timber industry has a bog, the auto industry has a bog, the building industry has a bog -
but, in my opinion, the concrete flooring industry definitely should not have a bog! Let me explain why.
What is a bog?
A bog is typically a highly filled, fast-cure product with very little resin in the mix. This makes it cheap, but prone to inconsistent adhesion and that’s exactly what you don’t want in a flooring environment. So what type of patching compound should you use?
Patching compound wish list
In my opinion, I want to do concrete repair with a product that has the following properties -
Resin rich - a two-pack epoxy system that is rich in resin so I don’t have to worry about adhesion. When applying patching compounds,
you find they tend to dry out as you scratch and scrape it across the concrete. If you start with a compound that’s dry to begin with,
it will quickly become unworkable and the adhesion even more of a concern.
Ready to mix - a pre-formulated, ready-to-use patching compound eliminates the inconsistencies adding in bits and pieces on-site can
Thickness range - a patching compound that be high build or feather edge and maintain its shape regardless. Being a high-build product, I
wouldn’t want any solvent or water in it as you could end up with solvent entrapment.
Working time - a longer standard working time is appreciated because patching can be a slow process, with the option of fast or slow cure a
Can be sanded - while sanding afterwards isn’t the aim, I’d prefer to have something that can be sanded if required.
Compatible - the patching compound would be totally compatible with my basecoat, e.g. didn’t cause blushing, so I could apply it wet
on wet rather than having to wait for the patch to harden or dry.
- Tintable - although not critical, I would also prefer the patching compound to be tintable in case patching was required between coats and there was a chance it could show through.
Do you have a good reliable patching compound available to you? Perhaps you have had to build your own patching compound?
Take care and keep smiling,
Want to learn more about this and related topics? We suggest the following Epoxy School courses:
Bronze Card Course
Short Course 1: