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How to fix cracks in bathtub?

Hi All - I have noticed these fine cracks coming up in my bath tub. These are mostly around the grip circles. While doesn’t seem like water may be going in through, however, one of the cracks is too big to ignore. Appreciate any suggestions to fix this issue.

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MitchellMc

Hi @newbie3,

It sounds like the cracks may be a result of delamination, possibly caused by the suction cups of a non-slip mat, as I experienced with a bath I re-coated a few years ago. Over time, wear and tear can weaken the coating, leading to cracks.

The most effective solution would be to remove the damaged coating entirely and reapply a new one. You can attempt this as a D.I.Y. project using a bathtub refinishing kit, but keep in mind that older tubs may have lead-based paint, so proceed with caution and ensure proper safety measures. Alternatively, seeking professional assistance could provide a more durable and high-quality finish. Regular cleaning and avoiding suction-cup mats in the future can also help prevent recurrence.

Please let me know if you have any questions.

Mitchell

newbie3

Thanks Mitchell for a prompt response. Apologies I had not shared a zoomed in picture. Pls see one attached now. Do you still reckon it can be taken care of by only the refinishing kit? No epoxy needed?

We haven’t used any bathmats in the last 5 years. Perhaps there are built in protusions on the floor of the tub for grip. What do you think?

many thanks again for your time.

MitchellMc

The tub coating product is a two-part epoxy @newbie3. However, you'd likely need to remove the existing damaged coating on the bath. You could try coating over it, but I am unsure as to the longevity.

What is the tube made from? Be advised these recoating products are not suitable for acrylic tubs as they flex too much.

Mitchell

newbie3

Thanks Mitchell!
I am not quite sure what material is the tub made up of. Here are some more pics for reference.

Is there an easy/ reliable way to check?

Nonetheless, the product you recommended - if that is epoxy based then it should be good for taking care of the minor cracks without needed for them to be filled in. Is that understanding correct?

many thanks again with your patience.

MitchellMc

Check to see if the base or side walls flex at all when you push them @newbie3. If they do move, then it's likely acrylic. If it is then I'd suggest enlisting the services of a professional for re-coating.

Mitchell

newbie3

Doesn't move at all. Solid as rock. Assuming it is fiberglass then?

MitchellMc

I'm sorry @newbie3. I was fairly convinced you couldn't use this product on acrylic, but apparently you can, and on fibreglass, too. Ideal for ceramic, porcelain, fiberglass, acrylic, cast iron, and steel surfaces.

Mitchell

newbie3

So to confirm I should give it a go with the refinishing kit, as per the product instructions. I shouldn't worry about filling in the individual cracks?

MitchellMc

It does say in the preparation instructions that cracks should be filled with a patching compound @newbie3. However, given that your cracks are hairline, I don't think you'd be able to fill them. A good sanding of the surface and coat over the top should cover them, but I can't guarantee they won't return in the future.

Mitchell

newbie3

Yeah.. I am contemplating giving it a go with Protite fiberglass resin with a flexible filling blade. Sand and paint.

I have used this product in an another bathtub in the past. Surprisingly after my second coat there were beads on the floor of the bathtub. What could have caused that?

JacobZ

Hi @newbie3,

That sounds like a good idea; however, it might be tricky due to their hairline nature. It is still worthwhile though as it will help seal any cracks that could create leaks in future.

With your previous project, did you sand the first coat?

If the first coat isn’t sanded, it may create a slick surface that the second coat cannot adhere to properly, leading to beading.

In future, you'll want to lightly sand the first coat with fine-grit sandpaper (e.g., 220-grit) to create a slightly rough surface for better adhesion.

Let me know what you think.

Jacob

newbie3

Thanks Jacob! I don't recall having sanded after coat 1. The product mentions to use within 4-5 hrs max of it being mixed. Will have to ensure I do it on a hot day so that coat 1 dries within 4 hours leaving me some time to put on the second coat.

JacobZ

Hi @DIY_newbie1,

You'd be better off mixing the product in batches to ensure the first coat can be perfectly dry before sanding.

You can use a measuring jug to ensure the correct ratio is kept.

Jacob

newbie3

That's a great idea Jacob.
I am losing my marbles!! Lol.

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