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In a nutshell:
Acyrlic/epoxy = Actual grout
Grout seal/pen/tube = Grout accessories
There are many kind of sealant in the market, like grout pen, sealant etc.
Do note that alot of product claims to be easy for application, it is mostly grout sealant.
It means the lower base of grout is still cement grout.
Type of grouting on market
Sanded
Epoxy
Non-Sanded
Liquid Based
Oil Based
Cementitious
Grout Sealer
Polyurethane
Polyaspartic
For grout pen, most acts like a marker that is easy and can help you to change the color of the grout. It also means it will wear off as dirt and fungus will still rest on grout after few days. It is good for short term aesthetics and is easily done with a few hours.
For grout sealant, depending on their chemical content percentage and material it is made from, most of it acts like a wax on top of your grout. It is a barrier that separates liquid and existing grout hence making grout unable to absorb liquid and dirt impenetrable. As it acts like a wax, mostly will wear and tear after a few weeks and is needed to reseal again. It can be colored or non colored hence also helping with the aesthetics and overall protecting your grout if done properly. It can takes up to a few days to get it done.
For grout spray, its function is alike to sealants, however as its content is thinner, it wears off faster than a grout sealant. It is good for fast and easy protection, however as it is mostly transparent it can't change the aesthetics and it mostly wears off after a few days too. It is advisable to clean grout before using these products as old fungus and dirt will be still affect your grout if not cleared.
For our service, we will be removing old grout along with all dirt/stain, fungus and mold before applying new grout or sealant that is a polyaspartic based. You can expect years lifespan, stain resistant and scratch/peel proof which cannot be done by sealant. There is also warranty after service so you can be sure it is the best results.