What is the difference between this and wood epoxy?

It is a two pack wood filler rather than an epoxy. It is ideal for filling gaps or making up areas where you have needed to cut out rot back to clean wood

Can this fix wood enough to not crack when its placed under heavy strain? I used a different bed filler and it came off after a single use

It depends how much filler and how deep it is applied. The timber to be filled should be 'completely' dust free prior to filling. Don't put the filler in too thickly. Make a number of applications. When the filler is freshly mixed it is moister and adheres to the timber better. If it starts to get a bit stiff it is better to throw what is left away rather than try to use it. It is better to mix up several smaller batches. Best Regards, Rex

do I use primer on wood filler orunder coat

Whatever you would use normally. Just treat the filler as wood.

would this work better than just using JB Weld to build up chipped off corners on a particle board speaker enclosure (i.e. not rot etc.)?

I have no experience of JB Weld so can't comment on the comparison. The Ronseal should work but sanding off to precise corners (once fully dry) will be tedious. And you'll clearly need to paint / spray over afterwards.

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Ronseal 35304 High Performance Wood Filler - Natural 550g

Product ID: 47889100

Details

Brand
Ronseal
Colour
Natural
Full cure time
30 Minutes
Item form
Paste
Item weight
0.28 Pounds

💧Water resistant durability

🔩Drill, screw & plane ready

🕒30 min fast cure

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NZ$78

Duties & taxes included

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Sold byAmazon New ZealandDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🛠️ Fix it fast, fix it strong — wood repair that lasts!

ROT REBUILDER - Effectively cures wet rot and prevents future damage, restoring wood integrity
VERSATILE USE - Ideal for both interior and exterior wood surfaces, from windows to doors
FAST TRACK FIXES - Dries in under 30 minutes so you can sand, shape, and paint without delay
ROCK HARD STRENGTH - Withstands up to 800 PSI tensile force for lasting repairs
NO SHRINK NO CRACK - Maintains perfect form over time—no unsightly gaps or cracks to worry about

Ronseal 35304 High Performance Wood Filler is a 550g natural-colored paste designed for professional-grade wood repairs. It cures in just 30 minutes, can be drilled, screwed, or planed, and offers water resistance with no shrinking or cracking. Perfect for rebuilding rotten wood and preventing wet rot recurrence, it delivers a durable, rock-hard finish suitable for both interior and exterior applications.

Specifications

ASIN	B001GU2H6S
Best Sellers Rank	303 in DIY & Tools ( See Top 100 in DIY & Tools ) 6 in Wood Fill 19 in Hand Tools (DIY & Tools)
Brand	Ronseal
Colour	Natural
Country Of Origin	United Kingdom
Customer Reviews	4.4 4.4 out of 5 stars (881)
Full Cure Time	30 Minutes
Global Trade Identification Number	05010214538690
Item Form	Paste
Item Weight	0.28 Pounds
Manufacturer	Ronseal
Manufacturer Part Number	35304
Material	Wood
Maximum Gap Fill	5 Millimetres
Model Number	35304
Number of Items	1
Surface Recommendation	Window, Door, Wood
Tensile Strength	800 Pounds Per Square Inch
Water Resistance Level	Water Resistant

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