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This product is now regulated by the HSE and we can only sell and send to business users. If you are not a business user we will need to refund the item from your order. Please include your business name at checkout.
Please follow the link provided and fill in where detail is required. Link to Oxalic Acid Form
Oxalic Acid Boat Cleaner is the perfect solution for boat owners everywhere! Mix 1 part oxalic acid with approximately 6-10 parts water, makes a highly effective cleaner for removal of stains and rust from gelcoat, stainless steel and wood.
It is an effective and powerful solution for removing tough stains and discolouration from boats. Ideal for tackling rust marks, waterline stains, and algae buildup, it works by breaking down organic deposits and restoring surfaces to their original brightness.
This versatile cleaner is safe for use on fibreglass, wood, and gelcoat surfaces when diluted appropriately. Its quick - acting formula makes it a go - to choice for boat owners seeking a professional - grade finish.
For best results, wear protective gloves when handling and dilute to create the effective cleaner. The Oxalic Acid Boat Cleaner is perfect for giving your boat a clean, polished look, ensuring it is ready for its next adventure.
Tip: Add some washing up liquid to the mix to help keep the acid on vertical surfaces!
Code: 11914
Customer Reviews5.05 5.0/5 Based on 35 reviewsShow all reviews
Delivered on timeReviewed by Hjrbuildersltd on 01 Dec 2025
Excellent service Delivered on time
Oxalic acid powderReviewed by Guybroom on 26 Oct 2025
Does what it’s supposed to do
Oak fench projectReviewed by Andy on 13 Oct 2025
Firstly, a big thankyou to FSL for getting this to me quickly. My customer recently had around 70 mtr of Oak fence installed, unfortunately the builders decided to store the oak under polythene sheeting and much of the oak started to go black before even being installed. I used the oxalic acid (a fairly strong mix) to treat the fencing and manged to get the majority of it done in just one day. Without a doubt this has saved me days of sanding. I would highly recommend this product and FSL. Thanks again Andy A T Decorators
Oxalic acidReviewed by Stuartellis75 on 23 Sep 2025
Delivered very quickly works an absolute treat
Oxalic acid cleanerReviewed by Mark.tuson on 22 Sep 2025
As advertised. Works well. promptly delivered and well packaged. Thank you
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.