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How to repair PVC inflatable hot tubs

How to repair PVC Inflatable Hot Tubs

This guide is for:

  • Repairing inflatable hot tubs

PVC / PU Inflatable Repair Guide
This guide is for repairing inflatables that are made with PVC and Polyurethane only

Safety first

Adhesives and solvents produce fumes which can be damaging to your health when inhaled, absorbed through the skin/eyes or ingested. The fumes are also highly flammable. Always read the product labels carefully before starting the repair job.

The work area

Successful repairs to hot tubs are dependent upon the environment in which the repair is carried out - ideal conditions are:

  • relative humidity less than 60% (low cost humidity meters can be obtained from most good DIY stores if unsure)
  • temperature between 18°C and 25°C
  • dry, shaded but well-ventilated work area
  • no naked flames or uncovered heat sources in the vicinity

Identify the fabric type

Before contemplating your hot tub repair and buying adhesive or a repair kit, you will need to identify the fabric that your hot tub is made from. The type of fabric determines the type of adhesive, solvent and patch fabric that is required to undertake the repair. Almost all inflatable hot tubs are made from PVC, but refer to the paperwork that came with your hot tub or manufacturer’s guidelines if you’re unsure.

Materials & tools required to complete this job

Inflatable repairs can be divided into small tears or punctures and larger tears (over 50mm long). Small tears/punctures can be repaired with a single patch to the outside of the tube, larger tears should be repaired by affixing a patch both inside and on the outside.

  • 2-pack Adhesive, such as Inflatex’s 2-pack Adhesive for PVC & PU fabrics
  • Correct fabric patch (2 x patches if the tear is greater than 50mm long).
  • Piece of polythene (if tear is greater than 50mm long. Cut to same size as inner patch)
  • Solvent/primer e.g. MEK or acetone
  • Mixing stick e.g. lollipop stick or epoxy mix stick
  • Clean, lint-free cloth
  • Short/stiff paint or glue brush
  • Removable marker pen or pencil
  • Masking tape
  • Seam roller or rounded object e.g. screwdriver handle (to remove air bubbles)
  • Optional: Heavy weight (to hold patch in-place whilst curing)

Materials and Tools
Materials & Tools

Get to work repairing the leaking inflatable hot tub

Locate the tear or hole on the tube. If unsure as to where the puncture is located, e.g. you have a ‘slow puncture’, then apply soapy water to the inflated tub and observe any bubbles forming at the puncture. Mark the location, dry the area and deflate the tub. At TubRepairs, we prefer to use a big wide paint brush for this, but a household spray bottle or sponge can work too.

Bubbles identifying leak
Bubbles identifying leak.

Cut a fabric patch (two if the tear is greater than 50mm) with rounded corners, allowing a minimum 5cm overlap around the hole/tear. Place the patch over the hole and mark around the patch on the tub with a pencil/removable marker. If tear is greater than 50mm long then also cut one matching shaped piece of polythene.

Outline of patch being marked on the tube
Outline of patch being marked on the tube

There is no need to abrade PVC fabric, but you will need to clean up / remove old glue or sealant from failed repairs. This is where sand paper is handy.

Clean/prime the back of the patch and the repair area, using a clean dry lint-free cloth, by wiping with MEK solvent or acetone. Wait until the solvent has evaporated. (N.B. with PVC fabrics, it is normal for the area to become 'tacky').

Clean the area
Clean and prime the repair area prior to applying the adhesive.

Mask around the repair area on the hot tub with removable masking tape to prevent unsightly adhesive ‘overspill’ when applying the adhesive. Allow a 2-3mm gap around the pencil/removable marker line to allow for some stretch in the patch when applied.

Mask the repair area
The repair area on tube being masked-up.

Mix the adhesive with a mixing stick, as per the instructions supplied with the adhesive.

If the tear is greater than 50mm then, using a brush, apply a thin, even coat of adhesive to the back of one of the patches and to the inner tub surface around the repair area. Leave to dry for at least 20 minutes, apply a second coat leaving it to dry for 2 minutes or until tacky.

Applying the adhesive to the back of the patch

Applying the 2-part mixed adhesive to the back of the repair patch

Place the piece of polythene over the applied adhesive on the patch so that the patch can be rolled-up into a cigar-shape without the adhesive sticking to itself.

Insert the rolled-up patch into the tub through the cut or tear in the tub.

Insert the rolled-up patch
Insert the rolled-up, polythene covered, repair patch into the tube through the tear or cut in the tub.

Unroll the patch inside the tube. Position over the tear and peel away the polythene to allow the two glued surfaces to meet (N.B. as adhesives are ‘contact’ adhesives then it is important to position the patch correctly as it will not be possible to re- position once in place). Smooth the patch firmly using a seam roller or rounded object (e.g. piece of shaped hardwood or screwdriver handle), working from the centre of the patch outwards to smooth out any air bubbles and ensure good contact.

Using a brush applicator apply an even thin coat of adhesive to both the back of the external tub patch and the masked repair area. Leave to dry for at least 20 minutes. Apply a second coat leaving it to dry for 2 minutes or until tacky. Apply the patch carefully to the repair area. 

(N.B. as adhesives are ‘contact’ adhesives then it is important to position the patch correctly as it will not be possible to re-position once in place).

Applying the 2-part mixed adhesive
Applying the 2-part mixed adhesive to the masked and primed repair area

 

Smooth down the patch firmly using a seam roller or rounded object (e.g. piece of shaped hardwood or screwdriver handle), working from the centre of the patch outwards, in order to remove air bubbles and ensure good contact.

Remove any bubbles with the seam roller
Smoothing the patch with a seam roller to expel air bubbles and ensure a good bond

If the patch is not sticking in places or air bubbles remain then the area can be gently heated with a hot-air gun or hair drier and ‘re- worked’ [Warning: do not use a hot-air gun or hair drier with adhesives or solvents still in the work area]

Remove the masking tape and clean-off any excess adhesive with the MEK solvent. It is important to remove any excess adhesive as if this remains on the surface of your tubes it will turn an unsightly brown!

Clean away excuse adhesive
Cleaning all excess glue from the repaired area

Place a smooth sided heavy weight on the patch and allow to 'cure' for 24 hours before re- inflating the tubes to check that the repair has been successful and before re-inflating your inflatable hot tub.

Repair Kits to repair your inflatable stand up paddle board can be found HERE.

Did you know that our glues and patches are used by a number of professional hot tub repair and hire companies?