For owners and contractors who want to apply the system themselves — the identical water-based, non-toxic primer and top coat our own crews use on-site, with coverage rates and application steps included.
What you're actually buying when you buy the chemical direct
Waterproofing chemicals bought directly from Zem Chemicals are not a separate, lesser product — it's the identical water-based, non-toxic primer and polymerised top coat our own crews apply on real jobs, sold by the 4 kg, 20 kg or 200 kg pail with the dilution ratio and coverage rate worked out for your exact area rather than a generic label instruction. The same chemistry covers wet areas too — bathroom waterproofing jobs use the identical ZEM Guard 209 coating available this way — and the reflective roof-cooling version is sold separately as ZEM-30 Heat Shield. Every pail comes with step-by-step primer-then-topcoat instructions and a WhatsApp number for questions mid-job; if you'd rather not do it yourself, the same system is available as a professional crew visit instead.
Coating applied straight over dust or a damp surface, with no primer
A single coat used where the surface actually needed two
Skipping the crack-filling step because it looks minor
Wrong dilution ratio applied, weakening the finished film
Coating applied and rained on before it had cured
The treatment
What comes with every pail
Written dilution ratio and coverage rate worked out for your exact area
Step-by-step primer-then-topcoat instructions
Crack-filling guidance before coating starts
A WhatsApp number for questions while you are mid-job
Option to have our crew do a final inspection once you are done
How the job runs
Four stages, in this order, every time
Skipping a stage is how a waterproofing job fails in year two. This sequence is not negotiable, whether our crew applies it or you do.
Order
Tell us the area
Send your covered area on WhatsApp and we work out exactly how many pails and how much primer you need.
Prepare
Clean and prime
Surface swept clean of dust and loose material, cracks filled, then primer applied and left to dry.
Apply
Two top coats
Applied at the stated dilution, second coat once the first has dried through.
Cure
Cure before water contact
The finished coat needs a dry window before rain or standing water — we tell you exactly how long for your weather.
Questions we get asked
Waterproofing chemicals — the practical answers
Can one person apply this on a small roof?
Yes — a small roof or bathroom is a realistic one-person, one-weekend job with a roller and a brush for the details. Larger areas go faster with two people.
What if I get the dilution wrong?
Message us the batch and area on WhatsApp before you mix — it takes two minutes and avoids redoing the job. We would rather answer that question than sell you a pail that fails.
Is it the same product your crew uses?
Yes, identical formulation, just sold by the pail instead of applied by our team.
Do you deliver, or is it pickup only?
Both — pickup from our Gulshan-e-Iqbal office, or delivery across Karachi for larger orders. Ask on WhatsApp for your area.
