Jesmonite Acrylic Sealer is a durable, pure acrylic coating designed to protect and enhance Jesmonite casts while preserving their natural, matte finish. Fully compatible with Jesmonite AC100, AC200 and AC300, it’s an excellent choice for crafters who want a reliable sealer that’s flexible, hardwearing and simple to apply by brush, roller or spray.
Used with Jesmonite AC100, this sealer provides increased water resistance, making it particularly useful when your finished piece will be displayed outdoors or exposed to moisture. It can also be tinted and thinned to create creative surface effects. Use it as a colour wash with Jesmonite Liquid Pigments to add a subtle patina, highlight texture, or artificially age decorative casts for a beautifully timeworn look.
For best results on low-porosity surfaces such as AC100, apply two coats. The first coat should be diluted with 10–20% water to support the bonding process. Apply the second coat once the first is touch dry and don’t let the first coat dry completely before recoating. Several thin coats will always give a more even, controlled finish than one thick coat. This sealer also goes a long way, so it's best to work in small amounts and avoid over-application.
To maintain optimal performance, sealed items may require re-coating every 6 to 10 years, depending on exposure and wear. Please note: when used with AC200 and AC300, you won’t achieve the same level of external protection as you do with AC100.
Application Guide:
Code: 12089
Customer Reviews5.05 5.0/5 Based on 2 reviews
FantasticReviewed by Natasha.bishop on 10 Feb 2026
Great product with fast deliver. Will be ordering again soon.
Fantastic productReviewed by Rachaelhillson73 on 13 Jul 2025
Second time using this company and this product is amazing and worth every penny.. thankyou for speedy delivery
Fibreglass Supplies use Royal Mail, APC Overnight and the National Hazardous Pallet Network for our Next Day Delivery Services.
Royal Mail
Orders of up to 2kg will usually be sent using a Royal Mail First Class Service for National Next Day Delivery.
APC Overnight
Orders over 2kg and up to 30kg will be sent using a Fully Tracked Next Day Service using APC Overnight. Some smaller Roofing Kits that weigh up to 30kg in Total would be sent on this service. This includes Resins, Gelcoats and Topcoats which are classed as Hazardous and are decanted into 5kg Tins or Pales to comply with the Transportation of Hazardous Goods Act.
Pallet Network
All our larger orders by weight would usually be sent using the National Pallet Network. Non Hazardous Items can be sent using either the Pallet Network or APC Overnight.
All Hazardous goods over 30kg (which includes Roofing Kits over 30kg in total weight) are usually sent using the National Pallet Network on a Fully Trackable Next Day Delivery Service.
Click & Collect
All orders are eligible for Click & Collect. Pick up your items conveniently from our Cattedown Store, available Monday to Friday between 7:30 am and 4:30 pm (excluding Bank Holidays).
NB - Please note that our Direct Control of the Delivery Element extends to making sure we pick pack and dispatch all orders on time. As we have no Direct Control over the performance of any individual courier we would not be responsible for refunds due to the late arrival of any order.
We always work hard with customers to overcome any issues that arise so please call us if you do have any concerns with regard to tight delivery deadlines so that we can provide great advice if needed.
Please read our Returns policy laid out below.
Under the Consumer Contracts Regulations 2014 you are entitled to return goods within 14 days of delivery for a refund of the cost of the goods. The delivery costs and any packaging are not included in the refund. The returned goods should be in the original containers and unopened. It is the customers responsibility to pay for the cost of returning goods to our Business Premises.
Some of our products are made to order and as such once ordered are non refundable and non returnable. These include coloured gelcoats, topcoats and resins.
These Consumer Regulations do not apply to business purchases (B2B). However we will always help in any way and look to find a suitable and mutually acceptable solution should any issues arise through the order process.
It is the customers responsibility to understand the suitability of the product before its use. Technical and Safety Data Sheets are available for all products where applicable. These can be found on most product description pages or if not are available on request. If you are unsure please do not hesitate to contact us for expert advice and product suitability and application.
To organise a return please contact us on the following.
